BERMAD C15 User manual

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C15, C35 - Combination Air Valve
Installation, Operation and Maintenance Manual (IOM)
2”; DN50 C15
2”; DN50 C35

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Table of Contents
General
Page 3
Safety
Page 3
Operational Data
Page 3
Materials and Connections
Page 3
C15 / C35 –Parts List
Page 4 - 5
Unpacking and post shipment - Inspection, Site Preparation, Installation
Page 6
Operation - Start-up and first operation, Operation Principals
Page 7
Maintenance - Inspection, Troubleshooting
Page 8
Disassembling & Reassembling
Page 9 - 12

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General
BERMAD C15/C35 is a high quality combination air valve for a variety of water networks and operating
conditions. It evacuates air during pipeline filling, allows efficient release of air pockets from pressurized
pipes and enables large volume air intake in the event of network draining.
With its advanced aerodynamic design, this double orifice valve provides excellent protection again air
accumulation and prevents vacuum formation with improved sealing at low pressure.
This document serves as the Installation, Operation and Maintenance Manual (IOM) of this valve; it
describes the procedures required for proper usage of the valve.
Safety
Since air valves operate in pressurized water systems, you are required to carefully read this manual
before using the valve. Handle the valve with care and make sure to comply with all the relevant required
safety instructions and standards, general and local.
Operational Data
Pressure rating C15 - ISO PN10, ANSI / ASME 150
C30 - ISO PN16, ANSI / ASME 150
Operating pressure range C10 - 0.1 -10 bar / 1.5 - 150 psi
C35 - 0.1 -16 bar / 1.5 - 230 psi
Operating temperature Water up to 60°C/ 140⁰F
Materials and Connections
Body material Glass-reinforced Nylon
Inlet diameter 2"; DN20
Connections Threaded Male BSPT, NPT
Outlet types sideways with 1½”; DN40 Female Thread

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C15 Part List

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C35 Part List

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Unpacking and post shipment inspection
Make sure that until the actual installation the valve remains dry and clean in its original package.
Unpack the valve and make sure that all the wrapping materials are removed.
Before installation it is necessary to inspect that no damage to the valve occurred during
shipment; do not install a damaged valve!
Verify that the valve to be installed meets the design specifications of the specific installation site;
take extra care in making sure that the expected systempressure complies with the pressure rating
of the valve.
Site Preparation
Air Valves located above ground should be protected from freezing, contamination and
vandalism.
If the valve is to be installed in a pit, make sure that the pit has proper drainage and sufficient
dimensions for servicing the valve.
Flush the pipeline prior to the Air Valve installation in order to prevent damage to the valve
internals due to large debris carried by the water during startup
The C30 / C31 air valves are not to be used in systems containing high suspended solids;
consider selecting other BERMAD Air Valve models for such water type.
Installation
Typical Applications
Main Irrigation Networks –Air relief, protection against air accumulation and vacuum formation
downstream of pumps, along supply lines and at elevations in main irrigation networks.
Irrigation Control Heads –Air relief, protection against air accumulation and vacuum formation
at filtration and fertilization stations and downstream of main control valves.
Infield Systems –Protection against air accumulation and vacuum formation in proximity to water
meters and automatic regulators.
Landscape Irrigation –Protection against air accumulation and vacuum formation.
Please note:
1. If required a Down Outlet and a Connection to a Drainage Pipe can be fitted to the 2" / DN50
valve’s outlet.
2. Depending on the specific installation requirements a Surge Protection (SP) or an Inflow
Prevention (IP) device may be added to the air valve.

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Installation instructions
• Install the Air Valve as close as possible to the pipe, at a high point of its circumference, in vertical
position (within 5 degrees of vertical alignment) and with its inlet facing down.
• The diameter of the pipe connecting the Air Valve with the pipeline should be at least equal to the Air
Valve inlet diameter.
• Install a shutoff valve between the air valve and the pipeline for allowing easy inspection and
maintenance.
Operation
Start-up and first operation
• Open the shutoff valve and verify that the Air Valve connections are not leaking; if needed follow the
troubleshooting instruction section of this document. Please note that at the first time the valve is filled up
some water may exit through its outlet port.
• Prevent water hammer during startup and pipeline filling by maintaining the velocity lower than
0.5m/sec (1.6 feet/sec). Consider adding the Surge Protection feature in systems where higher velocity
is expected.
Principles of Operation
Pipeline Filling
During the filling process of a pipeline, high air flow is forced out through the kinetic orifice of the air
valve. Once water enters the valve’s chamber, the float buoyed upward causes the kinetic orifice to
close. The unique aerodynamic structure of the valve body and float ensures that the float cannot be
closed before water reaches the valve.
Pressurized Operation
During pressurized operation of the pipeline, air accumulates in the upper part of the air valve chamber,
causing the float to gravitate downwards. This in turn causes the automatic orifice to open, releasing the
accumulated air. Once the air is discharged, the water level and float rise, causing the automatic orifice
to close.
Pipeline Draining
When a pipeline is drained, a negative differential pressure is created causing atmospheric air to push
the float down. The kinetic orifice stays open and air enters the valve chamber, preventing vacuum
formation in the pipeline.

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Please note
During initial valve filling as well as during the automatic air release some water may exit through
the valve outlet.
To ensure a completely dry environment near the air valve, a drainage pipe can be mounted on
the valve cover
Maintenance
Inspection
The valve does not require any specific maintenance, however a periodical inspection of the seals is
recommended for removing debris and foreign objects.
Troubleshooting
Symptom
Action
Leakage at the inlet connection
Tighten the valve connection, use thread sealant.
Check whether any part is damaged.
Leakage at the valve body
Tighten the valve's body, check the O-Ring
Leakage at the valve's outlet
Dissemble and inspect the valve's orifices, float and
seals.
Flush the valve to remove debris, Remove any
foreign objects, check and replace any damaged
part.
Valve does not release air or allow air
intake
Verify that the operation pressure does not exceed
the valve's rated working pressure.
Check and removed foreign objects, Clean the
valve's internal parts, replace if necessary.
Consult BERMAD if the symptom continues.

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Disassembling C15 / C35
1. Release the valve’s cover (Part #2) by turning it counterclockwise, un-screw and remove it from the
valve’s base (Part #1). Make sure that the valve parts, seated within the cover do not fall out of the
cover.
2. Inspect the valve basis O-Ring (Part #5011) and if necessary replace it with a new one. Make sure
that the new O-Ring is seated correctly in its designated groove in the valve’s basis.
3. Pull the float assembly (Part #3) out of the valve’s cover.
4. Disconnect the Kinetic Plug (Part #4 from the Float (Part #3) using its Snap Legs.
5. Inspect the float’s peal seal (Part #5 or #18) and the float (Part #3) for wear and tear.
6. If necessary replace the old parts.
Reassembling C15 / C35
1. Wet the Kinetic Seal with water and install it on the Kinetic Plug with its raised edges side facing
upward. See figure A.
Figure A

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2. Wet the new peal seal with clean water .Use the Insertion Assistance Handle and insert the peal seal
to its designated groove in the kinetic plug as shown in Figure B.
Figure B
3. Use the Insertion Assistance Handle and insert the peal seal to its designated groove in the automatic
float, insert the "legs" to the kinetic plug and then to the 2 holes in the automatic Float, See Figure C.
Figure C.
4. Once the Peal Seal is correctly seated in place, cut the insertion assistance handles and discard
them, See Figure D.
Figure D

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3.2 Take the kinetic plug which includes the automatic orifice and O-Ring. Connect the 2 "legs" to the
kinetic plug, See Figure G.
Figure G
3.3 Insert the "legs" to the 2 holes in the automatic float, See Figure H.
Figure H
4. Make sure that the valve’s basis O-Ring is fully inserted to its groove within the basis. See Figure I.
Figure I

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5. Insert the complete float assembly to its place in the Valve Cover, See Figure J
6. Reassemble the valve cover to the valve basis by screwing it on the basis thread. Tighten the cover
till the BERMAD logo is parallel with the wrench plats of the basis, See Figure K.
7. Once the valve is reassembled; perform a complete start up procedure as described above.
Figure J
Figure K