BERMAD C15 Manuale utente

Updated Jan 2020 Page #1

C15, C35 - Combination Air Valve

Installation, Operation and Maintenance Manual (IOM)

2”; DN50 C15

2”; DN50 C35

Updated Jan 2020 Page #2

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

Updated Jan 2020 Page #3

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

Updated Jan 2020 Page #4

C15 Part List

Updated Jan 2020 Page #5

C35 Part List

Updated Jan 2020 Page #6

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.

Updated Jan 2020 Page #7

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.

Updated Jan 2020 Page #8

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.

Updated Jan 2020 Page #9

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

Updated Jan 2020 Page #10

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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