Upstream for
pressure testing
(upper tap & plug)
Partial side view of valve body
showing location of tapped and
plugged holes for pressure and
seat leakage testing
OUT
FLOW
IN
Downstream for
seat leakage testing
(lower tap & plug)
Downstream tap & plug on
bottom of valve body for
3/4” NPT construction
1/8” pipe plug
(3/16 hex key wrench)
Figure 2. Provisions for pressure and seat leakage testing.
Testing for Internal (Seat)Leakage
CAUTION: Be sure valve can be tested without
affecting other equipment.
1.
Using a 3/16 hex key wrench, remove the 1/8” pipe plug
from the downstream side of the valve body. Then install
suitable test piping (e.g.; two short nipples and an elbow
or tubing) to check for leakage.
2.
Block fl ow downstream of valve.
3.
Restore electrical power supply and pressurize valve to
nameplate rating.
4.
With valve de
-
energized, immerse end of test piping in
a cup of water for 20
-
30 seconds and look for bubbles,
which would be indicative of seat leakage. Repeat this
procedure at several progressively lower pressures, down
to approximately 1/4 psi. Between each test, remove cup
of water and operate valve.
5.
If seat leakage is detected, turn off electrical power and
depressurize valve. Disassemble and check for proper
placement of parts, or any foreign matter that may have
entered the valve. Clean as necessary, reassemble and re
-
test valve for both external and internal leakage.
6. If no seat leakage is detected, remove test piping. Apply a
small amount of Loctite Corporation’s PST Pipe Sealant
567 (or equivalent) to the pipe plug threads. Reinstall the
pipe plug and tighten securely.
7.
Test for external leakage as described in
Piping
section.
8.
When maintenance is complete, operate the valve a few
times to be sure of proper operation. A metallic click
indicates the solenoid is operating.
ORDERING INFORMATION FOR
ASCO REBUILD KITS
Parts marked with an asterisk(*) in the exploded view are
supplied in Rebuild Kits. When Ordering Rebuild Kits for
ASCO Valves, order the Rebuild Kit number stamped on the
valve nameplate. If the number of the kit is not visible, order
by indicating the number of kits required, and the Catalog
Number and Serial Number of the valve(s) for which they are
intended.
I&M No. V 5538 R8
©ASCO Valve, Inc.®
50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
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