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:
6 of 10
Betts Industries Inc.
▪
814·723·1250
▪
1800 Pennsylvania Ave. West
▪
Warren, PA 16365
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Print Date: 1/22/2021
This form is considered uncontrolled 24 hrs. after print date.
Relieve hydraulic pressure and test valve. See section 5.1.
6.2 Rebuilding valve using replacement kit of PTFE parts
•
CH75296TF - Includes items
– 3,5,7,8,9,10,16,17,19
•
CH75296TFTS - Includes items
– 3,5a,7,8,9,10,16,17,19
Disconnect hydraulic line.
Hold valve in vice by cap collar (2).
Unscrew indicator pins (21) and piston holder assembly (15 and 20).
Unscrew piston (15) from piston holder (20) by
holding piston holder (20) in vice and using allen
wrench in end of piston (15).
•
Inspect piston (15) for scratches or pitting.
Replace if these cannot be easily removed by
polishing.
Using care not to damage the seal surface of the
piston holder (20), remove the O-ring seal (3) and
seal washer (19).
Insert new seal washer (19) and O-ring (3) being
very careful not to kink the O-ring (3).
Apply lubricant to O-ring seal surface of piston (15)
and also apply a high quality removable thread
lock compound to threads of piston (15) and
assemble to piston holder (20).
•
Torque piston to approximately 30 ft-lbs.
Set piston assembly aside.
PRE-LOADED SPRING:
Use caution when unloading and
loading spring; force is high and could cause bodily harm if not
contained properly.
PISTON
HOLDER
ASSEMBLY
INDICATOR PINS
PISTON
SEAL
WASHER
O-RING
PISTON
HOLDER