Form Title:
Document #:
INSTALLATION AND MAINTENANCE MANUAL
MM-CH004
(Form: DEF-006A-1)
Revision:
0
Document Title:
Date:
EXTERNAL CHEMICAL HYDRAULIC VALVE
Oct. 20, 2020
Page:
5 of 10
Betts Industries Inc.
▪
814·723·1250
▪
1800 Pennsylvania Ave. West
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Warren, PA 16365
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Print Date: 1/22/2021
This form is considered uncontrolled 24 hrs. after print date.
Refer to section 6; Disassembly and Rebuild Instructions for proper procedures to
replace the seat (5) and/or wiper (7)/packing (8).
5.2 To test the valve for hydraulic leakage:
Apply 3000 psi of hydraulic pressure to the hydraulic port and seal off from pump
if possible. (This is done to ensure that any leaks found are not due to the pump).
Allow the valve to remain in the open position for at least 1 minute.
There should be no loss of hydraulic pressure and the valve should not drift
closed.
Inspect the indicator pins (21), there should be no hydraulic fluid leakage in this
area.
If there is a loss in hydraulic pressure or the valve drifts closed, refer to section 6;
Disassembly and Rebuild Instructions for proper repair procedures.
6.0
Disassembly and Rebuild Instructions
6.1 To replace disc (4) and/or seat (5):
Attach hydraulic line and slightly open valve.
Hold cap collar (2) and remove cap nut (1).
Remove disc (4) and O-ring (3) from disc (4).
* Special note: If valve was manufactured
prior to February 1, 2016, a flat PTFE
washer, 16690TF, was used in place of the
O-ring. (see EB-01-16 for more
information).
Remove seat (5) using care to prevent
damage or scratches to the seat area of the
flange.
•
Inspect seat area of flange. Valve body must be replaced if there is any pitting
or damage in this area.
Place new seat (5) into seat area of flange, being sure that it is completely
installed into groove.
Install O-ring (3) into disc (4) and reinstall disc (4), cap collar (2) and cap nut (1).
Holding cap collar (2), torque cap nut (1) to approximately 40 ft-lbs.
* Special note: If valve was manufactured prior to February 1, 2016, a flat PTFE
washer, 16690TF, was used in place of the O-ring (3). Therefore, if the disc (4)
does not have a groove to accept the O-ring (3), use the flat PTFE washer,
16690TF, in place of the O-ring (3). (see EB-01-16 for more information).
0-RING
SEALING
SURFACE
CAP COLLAR
SEAT
SEAT AREA
SEALING
SURFACE
CAP NUT
DISC