Cla-Val 581 Series Technical Manual - Manual (Page 4)

SILENT CHECK VALVES
580 & 581
SERIES
INSTALLATION / OPERATION / MAINTENANCE
OPERATION:
Cla-Val Silent Check Valves operate automatically, to
open... when pump flow starts and close silently ...when
pump flow stops.
INSTALLATION:
Silent Check Valves, Wafer and Globe style must be
installed between flat faced iron or steel flanges per ANSI
B16.5 or Awwa 207, utilizing a full faced gasket to bridge
the joint between the seat O.D. (2) and the body (1) flange
face. In this manner a pressure seal at this joint is made
(see Note 1). Install the valve so that the nameplate data is
plainly read and the flow arrow points in the flow direction.
Detail
1
2
3
4
5
6
Description
Body
Seat*
Disc*
Spring*
Bushing*
Screw*
Material
Cast Iron
Bronze or SS
Bronze or SS
(Optional Buna-N
® )
Stainless Steel
Bronze
Stainless Steel
(3” & larger valves)
* Recommended Spare Part Kit
Note 2: All size 2” and 2 1/2” valves have
threaded seats in liev of screws
Series 581
Globe Style
Check Valve
2” thru 42”
MAINTENANCE:
Cla-Val Silent Check Valves are ruggedly designed for years
of trouble-free service. Therefore, regular maintenance is
not required. However, during initial start-up period the following
problems may surface (due to mis-application) that can be
easily resolved:
A. No Flow thru Valve:
1. Observe that the flow arrow name plate, on the
valve body, is pointing in the direction of flow.
2. Check that the down stream shut-off valve is full open.
B. Valve Chatters:
1. Confirm that the flow velocity is a minimum 3’/Sec.
2. Check that there is a minimum of 3 diameters of
straight pipe installed up stream of the silent check valve.
C. Valve Leakage:
1. Confirm a full face gasket is installed per Note 1.