Val-Matic Threaded Silent Check Valve - Manual (Page 3)

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VALVE CONSTRUCTION
The standard threaded check valve body (1) is
constructed of lead-free bronze and is certified to
comply with NSF/ANSI 372, “Drinking Water System
Components – Lead Content.” The internal metal
components are bronze or stainless steel. The body
(1) is threaded and designed to accept pipe nipples
with NPT pipe threads. The disc (3) and spring (4)
are the only moving parts and require no
maintenance or lubrication. The general details of
construction are illustrated in Figure 2.
FIGURE 2. VALVE CONSTRUCTION
TABLE 1. CHECK VALVE PARTS LIST
MAINTENANCE
Threaded Silent Check Valves require no scheduled
lubrication or maintenance.
INSPECTION: Periodic inspection for leakage can
be performed by listening for leakage noise from the
valve while the pump is shut down. If leakage is
heard, drain the pipeline, remove the valve, and
inspect the seating surfaces for wear or mineral
deposits. Clean or replace the valve as needed.
TROUBLESHOOTING
Several problems and solutions are presented below
to assist you in troubleshooting the valve assembly
in an efficient manner.
 Valve Chatters or Vibrates: Verify that velocity
is at least 4 feet per second. Noise sounding
like rocks in the line can be cavitation due to
high velocities, low downstream pressure, or an
upstream expanded. Verify that there are three
diameters of straight pipe upstream.
 Valve Leakage: Drain line, remove valve, and
inspect seating surfaces for debris or damage. If
body washer is leaking, apply torque to the two
body pieces.
 Valve Does Not Pass Flow: Check flow arrow
direction on valve body. Verify that downstream
isolation valve is open and there is no line
blockage downstream.
 Valve Slams: Remove valve and inspect spring.
ITEM DESCRIPTION MATERIAL
1 Body Lead Free Bronze
2 Seat Teflon
3 Disc Lead Free Bronze
4 Spring Stainless Steel
6 Seat Screw Lead Free Bronze
Spare Parts are not available for this valve.
A replacement valve is recommended.