Anti-hammer relief valve

Anti-hammer relief valve

RANGE / MARK ®
CHECK VALVES and STRAINERS
CHECK VALVES and STRAINERS
PRODUCT FAMILY
PIPELINE PROTECTION
PIPELINE PROTECTION
Main features

A pressure relief valve is a safety appliance which is capable of instantaneously evacuating a high flow rate.

It protects networks against overpressure due to sudden changes in flow rates (water hammer effects) for example when closing a valve too quickly or in case of sudden moving of air pockets inside the pipes.

The range goes from DN60 to DN200, PFA10, 16 or 25 bars.

The valve pressure set point has to be indicated by the customer at the order time.

Material and coating

ItemDesignationMaterialCoating

1

Adjusting screw

Stainless steel 18/8

2

Nut

Stainless steel A2

3

Nut

Bronze UE 7

4

Cap

Ductile Iron

Epoxy 200 microns

5

Spring holder

Steel XC 38

6

Spring

Spec Steel

7

Spring holder

Steel XC 38

8

Pin

Stainless steel

9

Bearing

Bronze UE 7

10

Clapper

Steel XC 38

11

Clapper gasket

Polyurethane

12

Upper stem

Stainless steel 18/8

13

Seat

Stainless steel 18/8

14

O’ring

Nitrile

15

Skirt

Steel A40

Epoxy 200 microns

16

Flange

Steel XC 38

Epoxy 200 microns

17

Pressure ¼’ gas

Hydraulic characteristics

The pressure values to be considered are:

  • PMS : network maximum service Pressure,
  • Valve pressure set point : Pressure at beginning of opening,
  • Overpressure: Pressure increase, compared with the pressure set point, to reach the maximum drained flow rate.

The valve pressure set point has to be indicated by the customer at the order time.

The valve pressure set point is given by the network maximum service Pressure (PMS) increased by 5 to 10 %.

Maximum drained flow rate

Choice of DN

DN of the appliance is determined as a function of the flow rate to be evacuated. As a general rule we should choose the flow rate of the pipe on which the relied valve is located.

Installation

The pressure relief valve is to be installed in a vertical position as close as possible to the source of the water hammer effects.

If it is installed in a manhole, an evacuation pipe must be provided. An isolating valve is recommended to enable work to be carried out on the relief valve (regulating, maintenance…) without interrupting the operation of the network.

DNHLx1
mmmmmm
60/6512001500
8012001500
10012001500
12515001700
15017001700
20017001700