Val-Matic Wafer and Globe Style Silent Check Valve - Manual (Page 3)

2
r vertical lines with the flow
o prevent turbulent flow
treams through the valve, which can cause
ibration and wear.
rizontal lines, the check valve
uirements are illustrated in
rawing SS-974F on page 3. The mating flange
nnot be used on the inlet side of
e valve. A ring flange having the maximum inside
be a maximum of 1/16" thick with the
d o t
must overlap eat to
provide a seal between the seat and the body.
langed valves with ring gaskets should use ASTM
A307 Grade B or SAE Grade 2 Carbon Steel bolts.
Higher strength bolts should only be used with full-
face gaskets.
A A valve
with butterfly isolation valves, the clearance between
the butterfly d
e
stem must be s
also shown on .
10 inch and smaller flanged end check valves have
sufficient clearance for most butterfly valves.
However, on 12 inch and larger valves, the plug
tightening of the bolts should then
INSTALLATION DJACENT V LVES: When mating the check
isc and the fully open check valv
checked. The location of the stem i
the check valve submittal drawings
The installation of the valve is important for its
proper operation. The flow arrow on the valve body
or nameplate must point in the direction of flow when
the system is in operation. The valve can be
stalled in horizontal o in
up or down. 14 inch and larger valves may require
extra heavy springs for flow down applications;
consult the factory.
Three diameters of straight pipe upstream of the
alve are recommended t v
s
v
When installed in ho
does not have a specific upward orientation. The
valve is usually installed so that the nameplate is
visible on the side of the valve for future reference.
MATING FLANGES: The valve should be installed
between standard flat-face flanges per ANSI B16.5
or AWWA C207. For globe style silent check valves,
the installation req
D
inside diameter must overlap the valve seat to
provide proper seat retention. Flanges or pipes
having an expanded inside diameter (ductile iron or
mortar-lined pipe) ca
th
diameter shown on the drawing must be inserted
between the valve and mortar-lined pipe. The
threaded seat wafer style silent check valves do not
require the mating flange to overlap the seat.
GASKETS AND BOLTING: The ring-type flange
asket can be rubber or compressed fiber but g
should
iameters sh wn in Drawing SS-974F. The gaske
the bronze or stainless steel s
F
shaft extends beyond the flange face and may
interfere with the operation of adjacent valves. A
short run of pipe or spacer may be needed between
the check valve and the isolation valve.
INSTALLATION: Lower valve over mating flange
using slings or chains around the valve body.
Lubricate the flange bolts or studs and insert them
around the flange. Lightly turn bolts until gaps are
eliminated. The
be done in graduated steps using the crossover
tightening method. Recommended lubricated
torques for use with resilient gaskets (75 durometer)
are given in Table 1.
If leakage occurs, allow gaskets to absorb fluid and
check torque and leakage after 24 hours. Do not
exceed bolt rating or crush gasket more than 50 per
cent of its thickness.
125# FLANGE DATA 250# FLANGE DATA
Valve
Size
Bolt
Dia.
Bolt
Torque
Valve
Size
Bolt
D
Bolt
(in) (in) (ft-lbs) (in)
ia.
(in)
Torque
(ft-lbs)
2.5 5/8 25-75 2.5 3/4 25-75
3 5/8 25-75 3 3/4 35-75
4 5/8 30-90 4 3/4 50-150
5 3/4 30-90 5 3/4 70-150
6 3/4 30-90 6 3/4 70-150
8 3/4 40-120 8 7/8 90-200
10 7/8 45-150 10 1 110-300
12 7/8 65-200 12 1 1/8 160-450
14 1 80-250 14 1 1/8 140-450
16 1 90-300 16 1 1/4 180-600
18 1 1/8 100-350 18 1 1/4 190-600
20 1 1/8 120-450 20 1 1/4 220-600
24 1 1/4 150-500 24 1 1/2 350-900
30 1 1/4 180-600 30 1 3/4 500-1500
36 1 1/2 250-750 36 2 700-2000
42 1 300-900 800-2500 1/2 42 2
TABLE 1. FLANGE BOLT TORQUES
WARNING: Flanges having an expanded
inside diameter such as mortar-
lined pipe cannot be used on the
inlet side of the valve or damage
may occur. Seat support rings
are needed.
CAUTION: Mating flanges must be flat faced
or damage to the valve may
result.
C TION AU : The u raise face es
xce olt que m
am e es.
se of d- flang or
e ssive b tor ay
d age valv flang