Meyer C series User manual

295-Q-002

Effective6-1-2020

HPSC, HPTC, LPTF Double

Flapgate Airlock Valve

INSTALLATION, OPERATION &

MAINTENANCEINSTRUCTIONS

Read this manual carefully before installing, operating, or maintaining this equipment. Failure to do so could

result in serious injury or death.

Save this manual

HPSC/HPTC LPTF

Your Source for Bulk Handling/Air Process Equipment

Wm. W.Meyer & Sons, Inc.

1700 Franklin Blvd.•Libertyville, Illinois 60048-4407 • 800-963-4458 •847 918-0111 • Fax: 847-918-8183

[email protected] · meyerindustrial.com · wmwmeyer.com

TABLE OF CONTENTS

SafetyPrecautions ....................................................................................... 2

Receiving & Storage .................................................................................... 7

Product Description .................................................................................... 8

Installation .................................................................................................11

Operation ...................................................................................................13

Lubrication/Service ....................................................................................15

SECTION I

SAFETY PRECAUTIONS

TO THE OWNER, AND INSTALLATION, OPERATION AND MAINTENANCE PERSONNEL

The safety ofthe operator and those people that may come into contact with the Double Flapgate

Airlock Valves (“Equipment”, “Double Flapgate”, “Valve”) is ofgreat importance toWm.W. Meyer &

Sons, Inc (“Meyer”, “Factory”). Insome applications, Single Flapgates are used. The hazards and

warnings in this document apply equally to Single, Double andTriple Flapgates. The decals, shields,

guards or other protective features furnished or recommended forthis machine are there for your

protection. BEFORE attempting toinstall, operate orperform maintenance onthis equipment READ

carefully and UNDERSTAND all safety instructions contained in this Installation, Operation, and

Maintenance Instructions. Failure to do socould result in serious injury ordeath.

Equipment owner responsibilities

Equipment owners are responsible forunderstanding the contents of this document and compliance

with applicable government laws and regulations and appropriate industry standards. In addition,

owners must create a control of hazardous energy procedure forthe complete system that

incorporates this Double Flapgate Airlock Valve and ensure that workers are properly trained tofollow

it. (See information regarding the vented isolation valve for air-operated units onpage 5.) Appropriate

plant safety and equipment training isthe responsibility of the plant owner. This Manual isintended

to assist the owner in the training process. The operation, installation and maintenance of this

equipment should be restricted based onthe following:

•

Installation and maintenance ofequipment must be performed by qualified mechanics/

millwrights/maintenance personnel that are familiar with the relevant contents ofthis manual.

•

Installation of any electrical equipment must be completed by qualified electricians,

in compliance with applicable codes and ordinances.

Because Meyer is not always aware of the application and does not always have access to the

installation, your participation in the safe installation, operation and maintenance of your Double

Flapgate is critical. The owner/operator is responsible for any hazards related to the material that is

being processed through the equipment. If you have any safety or operational questions pertaining

to the design or application of the Double Flapgate Airlock Valve we encourage you to contact the

Factory at (800) 963-4458. Consult the Factory for the availability of manuals in other languages.

SECTION VI

LUBRICATION/SERVICE

The internals of this equipment has parts that can crush and cut. Follow Lockout/

Tagout information in the "IMPORTANT SAFETY INFORMATION" section before service or

maintenance. Failure to do so will lead to serious injury or death if a body part contacts a moving

internal part. In addition, the equipment and parts are heavy - use safe handling and rigging methods.

Bearings should be grease lubricated at least once per month. In extremely dusty or high-temperature

applications, lubrication may be required more often. Removal of guards may be required on some

units to access the bearing’s grease fitting depending on the model and size. Standard bearings

require NLGI #2 grease. High-temperature bearings use DC-44 grease. Extremely high-temperature

applications use a graphite bushing that does not require grease.

1. Wipe off the grease fitting before adding grease.

2. Add grease into the bearing until grease is present at the bearingseal.

3. If contaminants are present in the grease, slowly add more grease until the discharge is clean.

Standard packing (HPSC & HPTC) is graphite impregnated aramid fiber (up to 450˚F) and for high-

temperature applications, a graphite/PTFE packing is used. The packing nut can be adjusted as

necessary to maintain the seal around the shaft. The packing should be replaced periodically to

maintain the shaft seal. Frequency depends on application and use.

The flange bearing seal on the LPTF valves seal the shaft opening and cannot be replaced separately

from the bearing.

Because of the wide variety of material-handling systems for which this Equipment must be tailored,

many considerations determine the proper size, design, materials of construction, operating

speed, type of driver, etc. A complete description of every product is kept on file with the Factory.

These specifications can be referenced by supplying the serial number to your local Meyer

Representative.

NOTE: To aid us in providing you with a special service, application assistance or for help with spare

part requirements, please record the following:

Type/Size

Serial No.

Date of Installation

ELECTRO-MECHANICAL ACTUATION STARTUP

Once all of the electromechanical components have been installed and wired and the Double

Flapgate Valve is properly andsafely attached tothe upstream anddownstream equipment (See

“HAZARD IDENTIFICATION” section) including all access doors being securely closed, the valve may be

test-cycled and set upfor regular operation. The Double Flapgate Valve cycling ratehas been factory

set and does not have any adjustments (unless a variable speed drive iscontrolling the motor, which is

not covered in this Manual).

Start the electric motor and observe the operation of the valves.

The motor is coupled to a gear reducer driving a cam assembly ata constant speed (normally 6 RPM).

As thecam turns, it contacts the upper and lower cam follower rollers. The cam contacts and pushes

on either the upper orlower cam followers, opening and closing the upper and lower gates

sequentially. These mechanical settings are factory set and should not require adjustment. Ifthey

loosen for some reason, the slots andhold-down bolts in the cam arms can be repositioned and

retightened toposition the cam arms for correct rotation.

The counterweights keep the cam followers riding onthe cam by applying downward pressure. To

adjust the amount of force acting on the cam, the counterweights can bemoved axially along the

length of each arm by loosening the nuts on the counterweight arms, moving the weight on the arm

and then re-tightening the nuts. To increase the force, move the counterweight away from the gate

shaft.

When the unit is operating satisfactorily, itcan begin handling material. Continue toobserve the

operation and make adjustments if needed.

Follow proper Lockout/Tagout procedures before making adjustments; failure to do

so could lead to serious injury or death.

GRAVITY ACTUATION STARTUP

Once all of the gravity control components have been installed and the Double Flapgate Valve is

properly and safely attached to the upstream and downstream equipment (See “HAZARD

IDENTIFICATION” section) including all access doors being securely closed, the valve may be test-

cycled andset upfor regular operation. The Double Flapgate Valve has been factory set, however, the

following adjustments may be made:

The weight of the processed material onthe upper and lower gates increases as the material is

introduced from above. When the combined weight of the material and the gate exceeds the force

provided by the external counterweight and any pressure differential, the gate opens and once the

material slides off the gate, the counterweight acts tore-close the gate, thereby creating a gravity-

driven open and closed cycle of each gate.

To counterbalance the action of the weight of the upper and lower gates, counterweight assemblies

are provided on the top and bottom on either side ofeach valve. Toadjust the amount offorce acting

to balance the material and gate loading, the counterweights can bemoved axially along the length of

each arm by loosening the nuts on the counterweight arms, moving the weight on the arm and then

re-tightening the nuts. Toincrease the force, move thecounterweight away from the gate shaft. By

moving the counterweights outward, more material will be required to force thegate open;

decreasing the number of cycles perminute. Moving the weights inward will have theopposite effect.

SIGNAL WORD DEFINITIONS

Indicates a hazardous situation which, if not avoided, will result in death or serious

injury.

Indicates a hazardous situation which, if not avoided, could result in death or

serious injury.

Indicates a hazardous situation which, if not avoided, could result in minor or

moderate injury.

Indicates information that is important, which if not followed, may cause damage to

the equipment.

IMPORTANT SAFETY INFORMATION

To reduce the risk of serious injury or death:

Be qualified.

Operation of this equipment must be limited to those that are properly trained in its use.

Servicing or maintaining this equipment must be performed by trained maintenance personnel only.

Read all safety information.

•Read and understand all the safety-related information contained in this manual prior to

attempting to perform any work on this equipment.

•Obey all the safety labels on the equipment. Do not remove any safety labels. If the equipment

is missing any labels (see “SAFETY LABELING” section), contact the Factory immediately, before

putting the equipment into service.

•For add on equipment; motor, switches, etc. refer to the appropriate manufacturer’s safety

information.

Heavy – handle safely. The weight of this equipment and its component parts could cause serious

injury if dropped or mishandled during installation, service, or maintenance. Always use safe

handling and rigging methods.

Guard and avoid dangerous internal parts. The internals of this equipment contains moving part(s)

that will crush and cut any body parts they come in contact with, resulting in serious injury or death.

•Equipment can be actuated remotely, without warning, if energized.

•Inlet and outlet flanges must always be permanently fastened tomating system

components or permanently guarded. Components and guards must be designed such that

no access to the interior of the equipment isallowed during operation. See “HAZARD

IDENTIFICATION” for process integration and installation details.

•Never open access covers/doorsor reach insidethe equipment for anyreason while it is in

operation.

Guard external moving parts. Unguarded external moving parts expose personnel to pinch points,

which could result in serious injury or death.

•Never operate this equipment without guards attached.

•Any accessory or auxiliary components installed with this equipment must have protective

guarding correctly installed and permanently fastened in place.

Lockout/Tagout all sources of energy and relieve pressure in accordance with the owner/employer’s

procedure for the control of hazardous energy before installing, servicing, or maintaining this

equipment or removing any access doors above, below, or on the valve itself. Potential sources of

energy include but are not limited to: motors, switches, cylinders, and solenoids. Also consider:

•Equipment may start remotely, without warning, if energized.

•For air actuated units, even if all sources of energy are locked out, there may be residual air

pressure in the actuator that must be relieved. Block further pressurizing with the lockable

in-line vented isolation valve. (See "Isolating Energy with Vented Isolation Valve" subsection

on page 5.)

•If electrical devices are part of the equipment, hazardous voltage exists and presents the

risk of electrical shock.

•Equipment may be under pressure – pressurized gas and material could cause serious injury

or death.

•Equipment surfaces may be hot; allow them to cool before performingany work.

Always ensure that any electrical devices present are properly grounded in accordance with OSHA, the

National Electric Code (NEC), and local codes. Failure to do so could expose personnel to hazardous

voltage which could lead to serious injury or death.

HAZARD IDENTIFICATION

Principle of operation

Double Flapgate Valves are components that are used as an airlock transition point, sealing pressurized

systems against loss of air or gas while maintaining a flow of material between components with

different pressures. They are a particularly versatile component that can be utilized in a wide variety

of material handling applications. By their nature, the valves are of no use by themselves; they are only

useful when added as a component to a material handling system as part of a larger process.

Amputation hazard

The Double Flapgate Airlock Valves use a common mechanical principle which creates an internal pinch

point in order to function properly: a metal plate, driven by a powerful actuator, rotates around an axis

from a hinged position to mate with a metal sealing surface.

If either the inlet or discharge openings are left unguarded, the Double Flapgate’s moving plate

presents a serious personal injury hazard, including but not limited to amputation. Any part of the

human body in the way of the plate and the housing will be crushed or cut off.

Failure to have these guards installed could lead to serious personal injury.

Your electro-mechanically actuated Double Flapgate Airlock Valves should now be ready for startup.

See the appropriate section for instructions.

GRAVITY ACTUATION INSTALLATION

These valves typically come completely assembled; however, the counterweights may need to be

adjusted during initial startup. See the appropriate section for instructions.

SECTION V

OPERATION/STARTUP

Prior to use, the operator must read and understand all the safety-related

information including all warnings and guarding instructions. Verify that all guarding isin place and

area is clear of all non-essential personnel. Failure todosocould lead toserious injury ordeath.

As discussed in the Product Description Section, your Double Flapgate Airlock Valve will be one of

the following types: Pneumatically driven operation, Electro-Mechanical or Gravity actuated with

counterweights.

When operating thisEquipment:

Instructions in this manual must be followed.

Do not operate this Equipment in excess of its rated capacity, speed, pressure or temperature.

Exceeding the operating parameters could damage the valves andvoid the warranty.

PNEUMATIC ACTUATION OPERATION

Once all of the pneumatic control components have been installed, electrical components wired

and the Double Flapgate Valve is properly and safely attached tothe upstream and downstream

equipment (See “HAZARD IDENTIFICATION” section),including all access doors being securely

closed, the valve may betest-cycled andset upfor regular operation. The Double Flapgate Valve

was run at the factory and the controls were set, however, the following adjustments may be made:

The timer may be adjusted to set the number of gate cycles per unit time. Set the timer to cycle

the gates at a rate appropriate for the application. As the timer relays go on and off, the control

output power is cycled to the solenoid valves, alternating the pressurized air supply to the front

and rear of each cylinder and thereby operating the valves. After start-up, the timer may be

adjusted to tune-in the operational cycle. Refer to the timer vendor information for details.

The flow control valves may be adjusted to tune-in the open and closed positions on each valve

to eliminate the flap slamming shut. If valves are slamming open or closed, or plantair pressure

is low, adjustments may be necessary to control the flow to and from the actuators. The flow

control valves are connected to the solenoid: one controls the closing speed of the gate while

the other controls the opening speed.

Double Flapgate Valves are sometimes customized to suit specific customer applications. This means

some of the components may be supplied by others and need to be installed on the valves.

Therefore, the installation and operating procedures for your equipment may vary from the

descriptions in this manual. When installing the equipment, refer to relevant information supplied by

others. These basic installation instructions apply to the HPSC & HPTC and to the LPTF versions.

PNEUMATICALLY OPERATED DOUBLE FLAPGATES

If a pre-piped and mounted pneumatic air set is provided, the first step is to connect the dry

compressed air to the air set.

If a pre-piped air set is not provided, the installer needs to install the components necessary for

controlling the cylinders.

The recommended regulator inlet air supply is 80 to 120 psig. The regulator outlet pressure is

typically set at 60 to 80 psig. Operating the gates below 30 psig isnot recommended.

Make certain no air is leaking from connections and pneumatic components.

If the solenoid was supplied as part of the air set, it will already be connected to the

filter regulator, if not those connections will need to be made atthis time.

Connect the solenoid to the timer box and then connect the electric power to the timer box.

Refer to the solenoid vendor information for specific details. Note: There are a number of

solenoids that are used with the Double Flapgate Airlock Valves, therefore specific connection

details are not part of thismanual.

There are two flow control valves on each solenoid of the Double Flapgate Valves. These are

factory set and typically require no adjustment.

Position switches may be provided to indicate whether the flap gate is open or closed. These

will need to be wired to power and control circuits. Refer to the switch vendor information for

instructions.

There may be additional custom devices supplied with the valves. Refer to the appropriate vendor

information for installation instructions. The pneumatically controlled Double Flapgate Airlock Valve

is now ready for startup. See the appropriate section for instructions.

ELECTRO-MECHANICAL DOUBLE FLAPGATE INSTALLATION

1. These Double Flaps use a motor to drive the actuation sequence. Electrical connections must be

done by a qualified electrician, in accordance with applicable codes and standards. Standard

rotation for the electric motor is counter-clockwise as viewed from the fan end. Rotation should

only be checked after proper guarding has been completed. There is a directional arrow on the

cam which indicates clockwise rotation. In order to check for the proper rotation, look through

the expanded metal guard, use a light if needed, so that you can see what direction the cam is

turning. “Bump Start” the motor and check for proper rotation.

2. In some cases, a motion or proximity switch may be provided. These switches indicate that the

gates are moving/shafts are turning. Refer to vendor information for wiring and installation

instructions (if not already installed).

3. A guard is provided around the rotating drive parts and must be in place during operation.

Guarding discharge

As a courtesy, the Double Flapgate isshipped with an attached discharge flange guard. This guard

should not be removed and should remain inplace during operation. However, due to the vast

number of potential applications inwhich the valves can be used, it is neither feasible nor practical for

Meyer to supply a discharge guard which will be effective inevery possible application or process. If

the supplied discharge flange guard does not work for your specific application orprocess, alternative

suitable guarding must be utilized to ensure safe operation. “Alternative suitable guarding” could be

another piece ofequipment, chute, bin orcustom discharge guard. Itisimperative that the valve

should not be operated without the discharge opening fully guarded such that no contact can be

made with the moving parts inside ofthe equipment. It remains the owner/operator’s responsibility to

ensure that the Double Flapgate issafely integrated for the particular process andapplication for

which it was purchased and that the discharge opening remains guarded at all times during operation.

Guarding inlet

In most applications, the Double Flapgate Airlock Valve will be integrated into a process, system or

application where the inlet opening of the valve will be guarded by virtue ofbeing attached to another

piece of equipment (bin, hopper, etc.) However, there may be instances orsituations where the inlet

of the valve becomes accessible (i.e. through a clean out door oraccess hatch on the attached

equipment) to a user. Asnoted above, due to the vast number of potential applications inwhich a

Double FlapgateAirlock Valve may beused, it is neither feasible nor practical for Meyer to design or

supply an inlet flange guard that will work for every possible application or process. Itis the

owner/operator’s responsibility toensure that the valve is safely integrated for the particular process

and application for which it was purchased and that the inlet opening remains guarded at all times

during operation.

Isolating Energy with Vented Isolation Valve

Even ifall sources ofenergy are locked out, the air-operated units may have residual air pressure in

the actuator. This air pressure must be relieved and further pressurizing of the actuator must be

blocked in order forthe Double Flapgate to be considered at “Zero Energy State” and comply with

Lockout/Tagout. The lockable in-line vented isolation valve included with the controls must be closed

and locked for this equipment tobedeemed safe to service or maintain. To dothis: close the valve,

slide the locking tab into position, and then secure the tab with the proper Lockout/Tagout device.

Training

The owner also bears the responsibility to ensure that personnel who maybeworking around a Double

Flapgate are properly trained. Personnel must be aware that: (1) anything coming into contact with the

moving plate will be cut off/amputated; (2) Double Flapgate valves can start without warning; (3)

before working on, cleaning, repairing ormaintaining a Double Flapgate valve, Lockout/Tagout

procedures must be strictly followed; and(4) valves must not be operated without guarding in place.

Before working around a Double Flapgate valve, personnel must read the Operator’s Manual.

SAFETY LABELING

The safety labels shown are affixed toyour Double Flapgate Airlock Valve. A Safety Supplement

Datasheet hasbeen packed with your equipment at the time of shipment. Because Double Flapgates

can be used in a vast number of applications and in a number of configurations, itispossible that the

safety labels affixed to the equipment may be obscured when installed and integrated into a

customer’s particular application or process. If this is the case, contact the factory for additional labels.

The following recommendations are offered to assist in the placement of additional safety labels if

needed. The objective is for anyone who approaches the Double Flapgate to be able to see the labels

alerting him or her how to avoid the hazard.

•Place labels in locations that all personnel operating and maintaining the Double Flapgate Airlock

Valve or any other people that may have access to the equipment will readily see as they are

preparing to work on the equipment and/or as theyapproach it.

•Due to the location of the Double Flapgate Airlock Valve, labels may have to be located near it, for

example: on nearby structural steel or adjacent equipment. This location needs to be the point of

access where the label can be easily seen and the hazard is clearly associated with the Double

Flapgate.

If you have received a unit without labels or if labels fall off or are damaged, contact Meyer

immediately (800-963-4458) to obtain replacements at no charge, prior to installation, use or

maintenance.

Please provide unit operating temperature at time of request.

A gravity-actuated valve gate will remain closed until the combination of process pressures and

process material weight exceeds the counter-force offered by the counterweight on a given valve. If

the pressure above the gate is greater than the pressure below, this force acts to keep the gate open

and conversely, if the pressure below is greater, this force acts to keep the gate closed. Once the

combination of material weight and the force of any pressure across the gate exceed the

counterweight force, the gate will open. Often, this same material load will drop from the upper to

lower gates, actuating the lower gate shortly after the upper gate releases the material, sometimes

allowing both gates to be open simultaneously and then closing once the material has been

discharged. The electromechanically operated valve can perform in a similar way, given sufficient air

pressures and material weights.

SECTION IV

INSTALLATION

When installing the equipment, verify that the openings will be properly guarded and that the labels

will be visible (See “HAZARD IDENTIFICATION” section). In addition, the installer must read and

understand the “IMPORTANT SAFETY INFORMATION” section before installing the equipment.

The internals of this equipment has part(s) that will crush and cut. Before installing

the equipment ensure that Lockout/Tagout procedures have been followed. Failure to do so will

lead to serious injury or death if a body part contacts a moving internal part.

BASIC DOUBLE FLAPGATE AIRLOCK VALVE MOUNTING

Normally, the Double Flapgate Airlock Valves are delivered fully assembled. For shipping purposes,

they may be broken down due to the overall height of the unit. The single valves/Dutchman can be

assembled together and then installed, or installed piece by piece.

1. We recommend that inlet and outlet flanges remain covered until the valve is ready to

be attached to the mating equipment.

2. Prior to installing the valve and with the power disconnected, check to ensure no foreign

objects have been left inside or have accidentally fallen into the valve.

3. Identify the inlet of the Double Flapgate before beginning installation. This can be done by

either comparing the equipment with the images in the product description section or to any

available literature or drawings. The metal plate/gate is flat on top and the gate lever is

attached below.

4. The Double Flapgate Valves must be installed with the top and bottom flanges level and

parallel to the mating system flanges using the appropriate fasteners. The valves must be

adequately supported to prevent distortion.

5. Ensure that the inlet and outlet flanges are permanently fastened to mating components or

are permanently guarded.

6. Check and make sure that the mounting fasteners are tight and that the equipment is

adequately supported.

7. The pneumatically actuated units were tested and adjusted prior to shipment. The gravity

actuated counterweight units will require adjustment during startup.

For pneumatic operation, the HPSC and HPTC use shaft-mounted rotary actuators while the LPTF has

the external end of the shaft keyed and clamped to a cylinder lever arm of a pneumatic cylinder.

For electro-mechanical operation, cam followers are mounted on the external end of the shafts. A

motor drives a gear reducer which has a cam mounted on its output shaft. This cam rotates and

sequentially actuates each cam follower, thereby opening and closing each gate. A counterweight

mounted on the opposite end of the shaft keeps the cam followers riding on the cam.

The gravity actuated valve relies on the combination of the weight of the material and system

pressure to open and counterweights to close.

HPSC & HPTC have rows of packing ring seals provided in the packing areas built into each side of the

housing. Packing gland nuts may be periodically tightened to compress the packing material, thereby

providing a seal between shaft and the housing. In some cases, air purge may be provided in this seal

area; one row of packing is removed and a lantern ring is installed in its place. Compressed air is then

introduced externally through a connection in the housing into the lantern ring.

LPTF utilize the flange mounted bearing seal to provide sealing around the shaft since these are for low

pressure differential applications.

BASIC OPERATIONAL CYCLE

A pneumatic Double Flapgate Valve has four repeating stages in its normal operating cycle, as

follows (refer to Figure below):

Stage I.

Stage II.

Stage III.

Stage IV.

At the start, top and bottom gates are both closed.

Top gate opens allowing the material to move inside the empty chamber between the

gates. The bottom gate remains in the closed position.

Top gate closes.

After the pre-determined cycle time, the bottom gate opens and allows the material

to discharge.

SECTION II

RECEIVING AND STORAGE

A. Receiving

Upon receipt of equipment and material from Meyer, the following basic steps should be taken. The

equipment is heavy and proper handling procedures should be used (See the “Heavy - handle safely”

information in the “IMPORTANT SAFETY INFORMATION” section).

1. Use thepacking list to determine that all the items shipped have been received. Your equipment

was carefully crated for safe shipment when given tothe carrier. Ifitems aremissing, contact

Meyer, per thecontact information at the end ofthis section.

2. Check for damage. Damage in transit is the responsibility ofthe carrier. Title toyour equipment

and all other items in the shipment were transferred to you as soon asthe shipment left our

dock, thus it is your responsibility tohandle any claim. In the event damage has occurred:

a. Be sure to have thedriver sign a copy of the freight bill with a notation about any

damage and contact their office before the driver leaves your premises.

b. Contact the carrier to arrange for an independent inspector to come out to inspect the

damage and to prepare the inspection report. It is imperative that this inspection isdone

before you start to unpack oruseany of the equipment.

c. If there are any visible problems with your unit or any other items in the shipment, you or the

driver must note indetail the damage onall copies of the freight bill before signing for the

shipment. Then immediately call Meyer.

d. Photographic records of the damage are helpful to communicate the extent and type

of damage as well as provide a clearrecord.

e. In addition to inspecting damaged equipment, you should also check thecondition of the

safety labels to ensure they have not been damaged or come off. Ifthey have, contact the

Factory for replacements prior to installation.

f. Concealed Damage: IfEquipment orgoods are discovered to be damaged inshipment at a

later date, contact the carrier and Meyer immediately.

g. In all cases of damage in transit, contact Meyer for assistance in determining whether or not

this damage may, in any way, affect safety orproper operation. Please contact us sothat

we can assist you with replacement parts orwith any questions about the claim process,

using the following contact information:

Wm. W. Meyer & Sons,Inc.

1700 Franklin Blvd

Libertyville, IL 60048

800-963-4458 or 847-918-0111

sales@wmwmeyer.com

B. STORAGE

If moved to storage, the Equipment should be located in a dry area, preferably inside. Outside

storage will require adequate protection from the weather.

The inlet and outlet of this Equipment should be securely covered to protect the interior while in

storage. For prolonged storage, an anti-rust compound should be applied to all interior surfaces.

See actuator and electrical component instructions for storage recommendations for these items.

After prolonged storage and prior to start-up, the Double Flapgate Valve and its actuator(s) should be

inspected and cleaned by qualified personnel. Contact Wm. W. Meyer & Sons, Inc. if any assistance

is required.

In the event this Equipment is to be stored for an extended period, the following Long Term Storage

procedures are recommended:

The Double Flapgate Airlock Valves and any ancillary Equipment supplied (e.g. solenoid valves,

limit switches, regulators, gauges, etc.) should be stored unpacked in a dry, humidity-controlled,

adequately ventilated, indoor area not subject to extreme temperature changes.

Flapgates should be stored in an upright position.

The interior of the valve should be sprayed with a rust preventative coating

All exterior exposed machined surfaces should be sprayed with arust preventative.

All openings must be sealed using pipe caps, plugs or metallic or wooden flange covers. Attach

flange covers using a full flange gasket or weather-proof seal and a minimum of four mounting

bolts.

Keep covers on until unit is installed for service.

These Equipment storage procedures are the minimum that should be performed. Other special

requirements may supplement this list, as recommended by specific component vendors,

environmental (e.g. corrosive environment) and other factors.

SECTION III

PRODUCT DESCRIPTION

The Double Flapgate Airlock Valve is specifically designed to control the rate of material flow through a

system, while at the same time preventing air leakage by isolating the processing system pressures

from one material handling point to another.

•HPSC & HPTC (High Pressure)

Differential pressure up to 20 PSIG and temperatures up to1650˚F.

•LPTF (Low Pressure)

Differential pressure lower than 1 PSIG and temperatures up to 250˚F.

Double Flapgate Airlock Valves are also suitable for conveying material that tends to bridge and

material that is: abrasive, chunky, friable, or difficult to handle.

The application conditions define the materials of construction of the basic valve housing and

components, depending mainly on process temperature, corrosiveness and potential wear. The seals,

bearings, gaskets and use of special features, such as air purge systems, are determined from

operating pressure, temperature, internal gas composition and other factors.

Double Flapgate Airlock Valves consist of two actuated gates that open and close against stationary

mating seats to fill and empty the chambers on top of the upper and lower gates.

The actuating method of the gate will be one of the following:

•Pneumatic operation

oOne actuator per gate.

Depending on process conditions only one actuator isemployed.

oTwo actuators per gate. (HPSC & HPTC only)

Over a certain process pressure, the force required toactuate a gate may require the

use of two pneumatic cylinders, one mounted on each side of each valve.

•Electro-mechanically motor-driven cam operation with counterweights

•Gravity actuated with counterweights

The high-pressure product comes in two basic configurations, HPSC (High Pressure Short) and HPTC

(High Pressure Tall) valves. The short version is most commonly used in applications where height is

limited. The tall version allows for higher volumetric flow rates. A spool piece or “Dutchman” can be

included between the gates to increase the internal volume.

The low-pressure units are only available in specific heights and are not available with different spool

pieces.

The standard materials of construction:

•HSPC & HPTC are made from mild steel, hi-chrome, stainless steel and Incoloy® depending on

application and temperature.

•Bearings, seals and gaskets are specific to the application.

•LPTF is fabricated from mild steel or stainless steel materials with the appropriate bearings,

seals and gaskets.

All the assemblies are comprised of housing, door(s), seat, gate, shaft, gate lever arm, and cylinder

lever arms.

•Seats are mounted in the housing by supportingbolts.

•Gates (also referred to as flaps) are connected to the shaft through the gate leverarm.

•Shafts are supported on two flange bearings mounted on thehousing.