GESTRA ZK 29 User manual

Control Valve
ZK 29
Original Installation Instructions
810685-05

Contents
Foreword ............................................................................................................................................3
Availability.............................................................................................................................................3
Formatting features in the document ......................................................................................................3
Shown and described types of equipment ...............................................................................................3
Safety..................................................................................................................................................4
Use for the intended purpose .................................................................................................................4
Basic safety notes .................................................................................................................................4
Information on property damage or malfunctions .....................................................................................6
Qualification of personnel.......................................................................................................................6
Protective gear......................................................................................................................................6
Typographic features of warning notes....................................................................................................6
Formatting features for warnings of property damage ..............................................................................7
Description .........................................................................................................................................7
Scope of supply and equipment specification ..........................................................................................7
Task and function................................................................................................................................16
Storing and transporting the equipment.........................................................................................16
Storing the equipment .........................................................................................................................17
Transporting the equipment .................................................................................................................17
Mounting and connecting the equipment.......................................................................................18
Preparing installation ...........................................................................................................................18
Connecting the equipment ...................................................................................................................19
Checking the function ..........................................................................................................................20
Starting up the equipment....................................................................................................................20
Operating the equipment .................................................................................................................23
After operation .................................................................................................................................23
Maintaining the equipment...................................................................................................................25
Rinse the equipment............................................................................................................................26
Disassembling the equipment...............................................................................................................28
Assembling the equipment...................................................................................................................37
Servicing the equipment and installing spare parts ................................................................................50
Troubleshooting ...............................................................................................................................51
Putting the equipment out of operation ..........................................................................................52
Removing harmful substances..............................................................................................................52
Removing the equipment .....................................................................................................................52
Disposing of the equipment..................................................................................................................54
Technical data..................................................................................................................................54
Dimensions and weights ......................................................................................................................54
Fluid flowrate and differential pressure..................................................................................................55
Pressure & temperature ratings............................................................................................................57
Manufacturer's Declaration.............................................................................................................57

3
Foreword
This installation & operating manual (IOM) will help
you use the control valve ZK 29 and its variants
(referred to as "equipment" in this document) safely
and efficiently for its intended purpose.
This installation & operating manual is intended for
anyone commissioning, using, operating, servicing,
cleaning or disposing of this equipment and, in
particular, for professional after-sales service
technicians, qualified personnel and authorised and
trained staff.
All of these persons must read and understand the
content of this installation & operating manual.
Following the instructions given in this installation &
operating manual helps avoiding danger and
increases the reliability and service life of the
equipment. Please note that in addition to the
instructions given in this installation & operating
manual you must also observe all locally applicable
rules and regulations concerning the prevention of
accidents as well as approved safety guidelines for
good professional practice.
Availability
Keep this installation & operating manual together
with the plant documentation for future reference.
Make sure that this installation & operating manual
is available to the operator.
The installation & operating manual is part of the
equipment. Please hand over this installation &
operating manual when selling the equipment or
passing it on.
Keep the applicable documents specified on page 7
together with this installation & operating manual
for future reference.
Formatting features in the
document
Certain text elements of this installation & operating
manual feature a specific typographic design. You
can easily distinguish the following text elements:
Standard text
Cross-reference
Listing
Sub-items in listings
Steps for action.
Here you will find additional useful
informatio
n and tips serving to assist you
in using the equipment to its fullest
potential.
Shown and described types of
equipment
The drawings and descriptions in this installation &
operating manual refer to type
ZK 29/14
If any other variant is shown or described it will be
explicitly stated.
This installation & operating manual (IOM) describes
standard equipment. Contact the manufacturer for
more information on the variants and types not
described in this document.

4
Safety
Use for the intended purpose
The equipment is designed for controlling and
regulating the level, pressure and flowrate of fluids
in heat and process control systems.
Correct use includes compliance with the
instructions given in this installation & operating
manual, in particular obedience to all safety
instructions.
Indications and instructions stated in the applicable
documents are part of this installation & operating
manual.
Any other use of the equipment is considered to be
improper.
Note that the equipment is also used incorrectly if
the materials of the equipment are not suitable for
the fluid.
The equipment is also considered to be used
improperly if:
the equipment is not in proper working condition
when being used
the equipment is used in operating conditions
that exceed the pressure and temperature
ratings and limits stated in this IOM and the
applicable documents
the equipment is retrofitted or modified without
the written approval of the manufacturer
the equipment is fitted with spare parts that are
not approved by the manufacturer
the equipment is provided with an actuator that
is not approved by the manufacturer
the equipment is operated or serviced by
unqualified personnel.
The personnel must have the qualification and
experience specified in section "
Qualification of
personnel " on page 6.
Basic safety notes
Explosion hazard
Explosion risk if equipment is used that is not
suitable for the environmental conditions. When
using the equipment in explosion risk areas
make sure that:
The permissible surface temperature of the
equipment for the place of installation must
not be exceeded.
If electrically insulated equipment is installed
appropriate measures must be taken to
discharge any static electricity between pipe
flanges.
The heat generated by friction caused by
moving parts that do not run smoothly can
cause explosions. Make sure that all moving
parts can operate smoothly.
When carrying out welding work in order to
install or remove the equipment flying sparks
may be generated that can cause fire or
explosion. Observe any on-site regulations for
fire and explosion prevention.
Only qualified personnel is allowed to mount or
remove the equipment or its components.
Risk of severe injuries
The equipment may become hot during
operation. Do not operate the equipment unless
thermal insulation or protection against
accidental contact prevents you from touching
hot surfaces.
The equipment is under pressure during
operation and may be hot. Before carrying out
any work on the equipment make sure that the
following requirements are met:
The pipes must be depressurized (0 bar).
The fluid must be completely removed from
the pipes and the equipment.
During work on the equipment the
installation must be switched off and
protected against unauthorised or
unintended activation.
The pipes and the equipment must have
cooled down to room temperature (approx.
20 °C).

5
If the equipment is used in contaminated areas
there is a risk of severe injuries or death caused
by harmful substances in or on the equipment.
Before working on the equipment make sure
that it is completely decontaminated. Always
wear the protective clothing prescribed for
contaminated areas when working on the
equipment.
The equipment must only be used with fluids
that do not attack the material and the gaskets
and sealings of the equipment. Otherwise leaks
may occur and hot or toxic fluid could escape.
The equipment and its component parts must
only be mounted or removed by qualified
personnel. A qualified person must be
acquainted with and experienced in the
following:
Making pipe connections.
Selecting suitable lifting gear and
understanding the rules for its safe use.
Working with dangerous (contaminated, hot
or pressurized) fluids.
If unsuitable lifting gear is used or the gear is
used improperly the equipment or parts of it
could fall down.
Make sure that only qualified personnel lifts
the equipment or parts of it.
Make sure that nobody is standing or
working below the hoisted equipment.
Make sure that the lifting gear is of sufficient
strength for the load to be hoisted and that
the load is properly secured and attached to
it. For more information on the nature and
weight of the components and safe lifting
points please contact the manufacturer.
Make sure that all locally applicable
regulations on safety and the prevention of
accidents are strictly adhered to.
If the admissible temperature and pressure
limits are exceeded the equipment may be
destroyed and hot or pressurized fluid may
escape. Make sure that the equipment is only
operated within the admissible service range
and limits.
For more information on limits and pressure &
temperature ratings see name plate and the
section "
Technical Data ".
The equipment may be damaged if the
connection of the equipment with the pipe is not
stable enough or the equipment is not
sufficiently supported. Hot or pressurized fluid
may escape. Only qualified personnel is allowed
to install and connect the equipment.
If the support of the equipment during
installation is insufficient the equipment might
fall down, thereby causing bruises or injuries.
Make sure the equipment is safely held in place
during installation and cannot fall down. Wear
the protective clothing specified for the place of
installation.
If the stuffing box is leaking there is a risk of
severe injuries caused by escaping hot fluid.
Use the equipment only if it is in proper working
condition. Replace any leaking stuffing box seal.
The equipment can be provided with different
types of actuator, e. g. with an electric or
pneumatic actuator. Depending on the type of
power supply for the actuator there is a risk of
severe injuries or death for various reasons.
Before working on the equipment cut off power
supply to the actuator. Observe all danger notes
and follow all instructions given in the
installation & operating manual of the actuator.
If you have a question please contact the
manufacturer of the actuator.
The moving parts of the equipment can cause
severe injuries or death. Make sure that nobody
is standing close to these moving parts or can
touch them while the equipment is operating.
Before working on the equipment make sure
that the power supply to the actuator is cut off
and cannot be switched on accidentally.

6
Risk of minor injuries
Sharp edges on component parts can cause
cuts. Always wear industrial gloves when
servicing the equipment.
The equipment can become hot during
operation. This presents the risk of burns
caused by heat radiation or when touching the
equipment. Do no touch the equipment during
operation. Always wear heat resistant protective
gear when working on the equipment.
Information on property damage
or malfunctions
Malfunctions will occur if the equipment is
installed in a wrong position or with the flow
arrow pointing in the opposite direction of the
fluid flow. This may result in damage to the
equipment or the installation. Make sure that
the flow arrow on the equipment body matches
the indicated direction of the fluid flow in the
pipe.
If the material is unsuitable for the fluid,
increased wear may occur and fluid may
escape. Make sure that the material is suitable
for the fluid used in your installation.
Qualification of personnel
A qualified person must be acquainted with and
experienced in the following:
the pertinent on-site rules and regulations for
preventing fire and explosions as well as
industrial safety regulations
working on pressure equipment
making pipe connections
working with dangerous (hot or pressurized)
fluids
lifting and transporting loads
observing all notes and instructions in this
installation & operating manual and the
applicable documents
connecting the power supply of the actuator
Protective gear
The required protective gear depends on the types
of fluid used and the regulations on site. For more
information on suitable protective clothing and
safety gear refer to the safety data sheet of the fluid
in question.
Protective gear comprises the following items:
Safety helmet to EN 397
Safety footwear to EN ISO 20345
Protective leather gloves to EN 388
Wear some form of ear protection to EN 352 when
standing close to the equipment (1 m or less)
during operation.
Typographic features of warning
notes
DANGER
Notes with the heading DANGER warn
against imminent dangerous situations that
can lead to death or serious injuries.
WARNING
Notes with the heading WARNING warn
against possibly dangerous situations that
could lead to death or serious injuries.
CAUTION
Notes with the heading CAUTION warn
against dangerous situations that could
lead to minor or moderate injuries.

7
Formatting features for warnings
of property damage
Attention!
This information warns of a situ
ation
leading to property damage.
Description
Scope of supply and equipment
specification
Scope of supply
The equipment is available with fitted actuator or
without actuator.
Our equipment is delivered packed and ready for
assembly.
Applicable documents
The following documents are part of the supply of
the equipment:
Declaration of incorporation
Documents provided by the manufacturer of
actuator
DImensional drawing with indications of centre
of mass
Data sheet
Parts list
These documents are part of the user
documentation and must be kept together with this
installation & operating manual for future reference.
Equipment specification
The equipment consists of the following main
components:
Body
Bonnet
Cover (only for ZK29/20)
Nozzle
If the equipment is fitted with a rotary actuator, the
bonnet and the upper part of the equipment form a
functional unit.
If the equipment is fitted with a pneumatic
diaphragm actuator, you can detach the bonnet
from the cover.
Different equipment variants are available. The type
designation has a code that indicates the respective
variant.
The equipment is available in sizes between
DN 25 and DN 150.
The body is available as straight-through or
angle-type. The code letter "D" in the type
designation indicates straight-through and "E"
indicates angle-type.
The equipment can be fitted with various types
of actuators. The actuator type is indicated by
the following code numbers in the type
designation:
01: Handwheel (retrofitting of an electric
rotary actuator NOT possible)
02: Handwheel (retrofitting of an electric
rotary actuator possible)
12: Electric rotary actuator1
13: Electric linear actuator1
14: Plug-in connection form B1,
EN ISO 5210 for an electric rotary actuator
20: Pneumatic diaphragm actuator
30: Lever actuator without part-turn actuator
attached1
31: Lever actuator with part-turn actuator
attached1
40: Hydraulic cylinder1
The throttling system has four stages for
pressure reduction.
1 Special design (Note that special design
versions are not described in this installation
& operating manual)

8
Example of type designations
"ZK 29-D50/14"
Straight-through equipment DN50 with plug-in
connection form B1 to EN ISO 5210 for an electric
rotary actuator.
"ZK 29-E/20"
Angle-type equipment with pneumatic diaphragm
actuator.
In most cases the equipment described in
this IOM is of the straight
-
through type and
has
a spindle bearing for an electric rotary
actuator.
If any other variant is shown or described it
will be explicitly stated.
End connections
The equipment is available with the following end
connections:
Butt-weld ends
Socket-weld ends
Flanges
The end connection is not specified in the type
designation.

9
Component parts
No.
Designation
1
Mechanical connection for actuator, in
equipment with rotary actuator this is a
spindle bearing (shown here)
2
Pneumatic diaphragm actuator
3
Bonnet
No.
Designation
4
Cover
5
Name plate
6
Flow direction arrow (on both sides)
7
Body

10
The yoke is fitted with the following items:
No.
Designation
8
Spindle
9
Scale marking indicator
10
Scale

11
The design and mounting of the stuffing-box
packing is different in equipment with rotary
actuator and equipment with pneumatic diaphragm
actuator
Stuffing box in equipment with rotary actuator
No.
Designation
11
Stuffing box gland
12
Packing rings
13
Distance sleeve
No.
Designation
14
Base bushing
15
Hinged bolts

12
Stuffing box in equipment with pneumatic diaphragm actuator
No.
Designation
12
Packing rings
14
Base bushing
16
Union nut
No.
Designation
17
Packing gland
18
Grooved ring

13
The following items are fitted inside the equipment:
No.
Designation
19
Body gasket
20
Hexagon-head screws with lock wire
21
Thrust ring
22 Anti-wear element (sleeve or ring -
depending on equipment type)
No.
Designation
23
Gasket
24
Stem
25
Seat ring
26
Sleeve insert (pinned together with rivet)

14
Optional extras
The following items are available as optional extras:
Grease nipple (only on actuator with handwheel
or electric rotary actuator)
Connecting for sealing fluid
Sampling valve
Mechanical lift stop (not for equipment with
pneumatic diaphragm actuator)
The stem lift in equi
pment fitted with a
pneumatic diaphragm actuator can be
limited by means of a handwheel attached
to the actuator.
No.
Designation
27
Grease nipple
28
Sampling valve
29
Connecting for sealing fluid
30
Mechanical lift stop

15
Name plate
The following items are indicated on the name
plate:
Manufacturer
Type designation
Design
Nominal size
Pressure rating
Max. service temperature
Max. service pressure
Max. admissible differential pressure
Flow characteristic
CE marking
Serial number
The following items are indicated on the equipment
body:
Material
Identification marking of material testing
Batch code
Direction of flow
Manufacturing date (quarter/year)
Application of European Directives
Pressure Equipment Directive
The equipment conforms to this Directive (see
"Declaration of Incorporation" section) and can be
used for the following media:
Fluids of group 2
ATEX Directive
The equipment has classification: CE Ex II 2G/D c X.
For use in potentially explosive atmospheres in
zones (surrounding atmosphere to Directive
1999/92/EC) 1, 2, 21 and 22, please read and
observe the following information:
The sign "X" in the Ex label signifies that operation
at an excessive surface temperature caused by the
medium must be avoided. The equipment itself
does not generate additional surface temperatures.
Once installed, static electricity may arise between
the equipment and the connected system. During
use in potentially explosive atmospheres, the
discharge or prevention of possible electrostatic
charging is the responsibility of the manufacturer or
owner of the system. If there is a possibility that
medium might escape, e.g. via actuating devices
or leaks in screwed couplings, the manufacturer or
owner of the system must take this into
consideration when dividing the area into zones.
The equipment classification and Declaration of
Conformity do not apply to any electric, hydraulic or
pneumatic drive that may be installed.
If using the equipment with a drive, the category of
the drive may have an adverse effect on the
equipment category 2G/D.
Please read and observe the relevant
information in the drive manufacturer's
documentation.

16
Task and function
Purpose
The equipment is designed to reduce pressure in
pipes through which the following fluids flow:
water
steam
condensed water
In addition the equipment can control the flowrate
and the fluid level. The equipment can stop the fluid
flow completely, effecting a pipe seal to attain
bubble-tight shut off.
The control edge prevents high flow velocities at the
seat area during the opening and closing process,
thereby minimizing wear on the seating surfaces.
Function
The equipment features a system of flash chambers
where the differential pressure is reduced in stages
and the flow is split up into many partial flows.
This decreases the noise level during operation and
extends the service life of the equipment thanks to
reduced wear.
The equipment is fitted with an externally actuated
stem. During the opening process the stem controls
the fluid flow by successively opening a series of
flash chambers.
When the stem is in the closed position the fluid
flow is completely stopped and bubble-tight closure
is ensured.
When the equipment is closed the stem (24) is in
the lowest position.
In this position the fluid flow is stopped.
During opening the stem is lifted off the seat ring
(25). As a result the nozzle orifices (31) in the
sleeves are opened successively.
When the stem is completely lifted, the fluid can
flow through all nozzle sleeves and the max. fluid
flowrate is reached.
The optional mechanical lift stop allows you to set a
minimum flowrate that will constantly flow through
the equipment.
Storing and transporting the
equipment
Attention!
Equipment can be damaged if stored or
transported improperly.

Close all openings with the sealing
plugs or covers supplied with the
equipment or use similar sealing
covers.

Protect the equipment against
moisture and corrosive atmospheres.

Please contact the manufacturer if the
specified transport and/or storage
requirements cannot be met.

17
Storing the equipment
Please observe the following items when storing
the equipment:
Make sure that the equipment is completely
disconnected.
Before storage make sure that the equipment is
dry and free from any fluid residues.
The equipment must be protected by its
packaging. The packaging must protect the
equipment from moisture and mechanical
damage.
The equipment must be stored in a horizontal
position.
Make sure that the stem of the equipment is
moved at least every two months in order to
avoid that the packing rings get stuck.
CAUTION
There is a risk of getting crushed by the
spindle.

Wear sturdy leather gloves when
working on the spindle or stem.

Make sure that no persons are in the
area of the spindle or stem.

Move the spindle slowly.
Follow all instructions given in the installation &
operating manual of the actuator.
Make sure that all these requirements are
always met when storing the equipment.
Please contact the manufacturer if you cannot
comply with the recommended storage
conditions.
Transporting the equipment
DANGER
Risk of bruises if the equipment or
component parts fall down.

Always wear protective gear when
working on the equipment.

Use suitable lifting gear when moving
or lifting the equipment and/or
component parts.

Make sure that the equipment cannot
topple over.

To lift the equipment use only the
valve body or the bonnet.

Make sure that nobody is standing
below the lifted equipment.
The protective gear must comprise at least the
following:
Safety helmet to EN 397
Safety footwear to EN ISO 20345
Protective leather gloves to EN 388
For more information on suitable safety clothing and
safety gear refer to the safety data sheet of the fluid
in question.
The lifting gear must be of sufficient strength for
the equipment including the actuator.
For more information on the weight of the
equipment see the attached documents. For more
information on the weight of the actuator see the
documents provided by the actuator manufacturer.
For more information on lifting points and the
centres of mass see the attached documents.
Carefully clean the equipment before
transportation.
Meet the requirements for storage also when
transporting the equipment.
Prior to transport seal off connections with
sealing plugs.

18
If you do not have the sealing plugs
supplied with the equipment use
a
ppropriate seal caps to seal off the
connections.
For short distances (only a few metres) you can
transport the equipment unpacked.
When transporting the equipment over larger
distances use the original packaging.
If you do not have the original packaging use a
box that protects the equipment adequately
against corrosion and physical damage.
Mounting and connecting the
equipment
DANGER
Risk of bruises if the equipment or
component parts fall down.

Always wear protective gear when
working on the equipment.

Use suitable lifting gear when moving
or lifting the equipment and/or
component parts.

Make sure that the equipment cannot
topple over.

To lift the equipment use only the
valve body or the bonnet.

Make sure that nobody is standing
below the lifted equipment.
The protective gear must comprise at least the
following:
Safety helmet to EN 397
Safety footwear to EN ISO 20345
Protective leather gloves to EN 388
For more information on suitable safety clothing and
safety gear refer to the safety data sheet of the fluid
in question.
The lifting gear must be of sufficient strength for
the equipment including the actuator.
For more information on the weight of the
equipment see the attached documents. For more
information on the weight of the actuator see the
documents provided by the actuator manufacturer.
Preparing installation
Remove the transport packaging.
Check the equipment for transport damage.
If you detect any transport damage, please
contact the manufacturer.
When supplied by the factory, the connections may
be sealed off with sealing plugs.
Remove sealing plugs before mounting the
equipment.
Keep the sealing plugs and the packing for
further use.
DANGER
Personnel working on pipes are
exposed to
safety risks and may suffer severe injuries,
poisoning or even loss of life.

Make sure that no hot or hazardous
fluid is in the equipment or the pipes.

Make sure that the pipes upstream
and downstream of the equipment are
depressurised.

Make sure that the installation is
switched off and protected against
unauthorised or unintended activation.

Make sure that the equipment and the
pipes have cooled down to room
temperatures.

Wear protective clothing that is
suitable for the fluid and, if necessa
ry,
wear protective gear.
For more information on suitable protective clothing
and safety gear refer to the safety data sheet of the
fluid in question.
Drain pipes until they are empty.

19
Switch the installation off and protect it against
unauthorised or unintended re-activation.
Connecting the equipment
DANGER
Incorrectly connected equipment can result
in accidents with extremely severe injuries
or death.

Make sure that only specialist
personnel connect the equipment to
the pipe.

Make sure that the direction of flow in
the pipe matches the flow direction
arrow on the equipment.

Make sure that the connected pipe
does not subject the body to any
stress (forces or torques) during
installation and operation.
Specialist personnel must have knowledge and
experience of the type of pipe connection used.
An arrow indicating the flow direction is
provided on both sides of the inlet of the
valve body.
Attention!
Equipment will be damaged if the support
is undersized or in the wrong place.

Mount the support to the pipes next to
the equipment.

Make sure that the supports are
strong enough to hold the weight of
the equipment and to withstand the
forces that occur during operation.

Contact the manufacturer if you want
to mount the supports directly to the
equipment.
The equipment is designed for installation
with the stem in vertical position and the
actuator mounted on top.
Other installatio
n positions are possible.

Contact the manufacturer if you want to
mount the equipment in a different
position of installation.
Mount the equipment in the desired installation
position.
Make sure that the equipment is supported by
the pipes.
If the supports can only be attached
directly to the equipment ask the
manufacturer for more information on
po
ssible positions for the supports.
Connect the end connections of the equipment
properly to the pipes.
Some materials require a subsequent heat
treatment of the welds after the equipment has
been welded in place. If you want to perform a heat
treatment please observe the following notes:
You do not have to remove the internals of
the equipment in order to perform the heat
treatment.
Attention!
The equipment might get damaged.

Make sure that only qualified
personnel carries out the heat
treatment.

Before starting the heat treatment
make sure that the equipment is not
insulated.
Specialist personnel must be highly qualified and
fully experienced in making welded joints with the
type of material used. For information on the
materials of the equipment see the nameplate on
the equipment.
Make sure that the valve is at its middle
position, i. e. half stroke.

20
Make sure that only qualified personnel carries
out the heat treatment.
After the heat treatment you may insulate the
equipment if necessary.
DANGER
Incorrectly connected equipment
can
cause fatal accidents or severe injuries.

Make sure that only qualified skilled
personnel connect the actuator to the
power supply.

Follow all instructions given by the
actuator manufacturer.
Specialist personnel must be highly qualified and
fully experienced in connecting the power supply in
question.
Connect the actuator properly with the
mechanical connection of the equipment.
For more details on how to connect the
actuator with the stem and how to mount
the mechanical connection see page
37.
Connect the actuator properly to its power
supply.
Checking the function
Make sure that the equipment is safely mounted
and that all connections are made correctly.
CAUTION
There is a risk of getting crushed by the
spindle.

Wear sturdy leather gloves when
working on the spindle or stem.

Make sure that no persons are in the
area of the spindle or stem.

Move the spindle slowly.
Carry out a performance test to check the
functions of the equipment.
The stem must perform at least one full valve
stroke.
Change, if necessary, the actuator settings as
indicated in the operating manual of the
actuator.
Starting up the equipment
To finish the installation work please perform the
following jobs:
Adjust the stuffing box
Rinse the equipment
Adjust the mechanical lift stop (if provided)
Flush the installed equipment as described on
page 26.
Adjusting the gland seal
DANGER
Personnel working on pipes are exposed to
safety risks and may suffer severe injuries,
poisoning or even loss of life.

Make sure that no hot or hazardous
fluid is in the equipment or the pipes.

Make sure that the pipes upstream
and downstream of the equipment are
depressurised.

Make sure that the installation is
switched off and protected against
unauthorised or unintended activation.

Make sure that the equipment and the
pipes have cooled down to room
temperatures.

Wear protective clothing that is
suitable for the fluid and, if necessary,
wear protective gear.
For more information on suitable protective clothing
and safety gear refer to the safety data sheet of the
fluid in question.
In equipment with pneumatic diaphragm actuator
the stuffing box can be adjusted via the union nut.