Val-matic Swing Check Valve User Manual download pdf (Page 4)

VAL-MATIC'S SWING CHECK VALVE

OPERATION, MAINTENANCE AND INSTALLATION

Page 4 of 13

disc has a chance to react to the diminishing

forward velocity of the water, the disc will be

driven to the closed position by the rapid flow

reversal. Depending on how fast the reversal of

flow takes place, a water hammer of different

magnitudes will develop.

The valve is available with an adjustable lever and

weight, an optional and adjustable lever and

spring assembly and a side mounted air cushion.

These assemblies and adjustments may be used

to vary the valve’s closing operation in order to

reduce the magnitude of the closing water

hammer.

The side mounted air cushion was designed to

solve minor water hammer problems. It should be

stated, that because the control media is only a

small volume of air at atmospheric pressure, that

is compressed to a maximum of 200 PSI and then

vented to the atmosphere thru a small flow control

valve, it should not be considered as a total

solution for severe water hammer problems.

INSTALLATION

The swing check valve with spring, weight and

lever, or weight, lever and

side mounted air

cushion can only be used for horizontal flow or

vertical flow-up applications. The valve must be in

a laminar flow region of the piping system. Avoid

locating the valve immediately downstream of a

pipe elbow or in a cavitation zone because the

turbulence in these regions will cause excessive

disc motion and will result in premature wear.

For horizontal flow applications the valve must be

installed with both of the pivot trunnions located

above the horizontal center-line of the valve and

the common center-line of the hinge trunnions

must be level to the horizontal plane of the valve.

For vertical flow up applications the counterweight

arm should be in the horizontal or about 30° below

horizontal position when the valve is

in the closed

position. The counterweight arm has multiple

keyways to allow for mounting in several

orientations.

Before installing the valve in the space provided,

check to make sure that the pump discharge

piping is free of foreign objects such as lumber,

tools, rocks, etc., which can damage the swing

check valve when it is placed in service.

When lifting the valve for installation, make sure

that lifting chains or straps are not attached to or

allowed to come in contact with the hinge pin,

counterweight arm or the side mounted air cushion

assembly. Also do not allow the weight of the

valve to rest on the hinge pin, counterweight arm

or the side mounted air cushion assembly.

Each valve is provided with a flow arrow integrally

cast on the valve cover. The flow arrow must

point in the direction the water will flow, when the

system is operating.

AWWA C508 swing check valves are furnished

with flat faced flanges and should only be mated to

a flat faced companion flange. A full faced or ring

gasket, that has been lubricated with a gasket joint

compound, must be installed between the valve's

flange and the companion flange to effect a seal.

Flange bolting shall be in accordance with ANSI

B16.1 Section 5.2 for cast iron bodies and ANSI

B16.42 for ductile iron bodies. Note: Val-Matic

does not recommend the use of high strength

flange bolting with these valves.

Before installing the flange bolting, the valve and

the adjacent piping must be supported and aligned

to prevent cantilevered stress being transferred to

the valve's flanges when installing the flange bolts

or studs.

Apply a thread lubricant to the flange bolt threads

and install the flange bolts and nuts around the

flange. Once all the flange bolts or studs are

inserted around the flange bolt circle, tighten them

hand tight.

Recommended flange bolt lubricated target torque

values for use with resilient gaskets (75

durometer) are given in Table 1. If leakage

occurs, allow gaskets to absorb system fluid and

check torque and leakage after 24 hours. Do not

exceed the bolt rating, the maximum torque of

Table 1, compress to more than the gasket

manufacturer’s thickness recommendation or

extrude gasket.

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Val-matic Swing Check Valve User Manual Page 4

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