Prepared by: CJC
Rev. #: A
Approved by: DLW
1
Date: 2/18/98
Revised by:
RJG
Revision Date: 04/09/12
1200000
BALL VALVE QUARTER TURN - SELF LOCKING
The Darley Ball Valve is a quarter turn, all bronze valve designed for the fire service.
The ball is cast bronze, precision machined
stainless steel ball
for long trouble free service. It is easily serviced in the
field.
The lever is self locking and easily adjusted, even under extreme high pressure.
TO DISASSEMBLE AND REPAIR THE BALL VALVE
ILLUSTRATION DGC0100
TOOLS REQUIRED:
3/16” Allen Wrench
1-1/8” Wrench
3/4” & 1” Wrench
Vise Grips or Pliers
1. Remove cap nut (20) and adjusting nut (16).
2. Lever Assembly (11) pulls straight up. Watch for 2 cam balls (12).
3. Unbolt and remove clutch ring (9), clutch sleeve (8), valve stem (7), spring (14), and valve stem washer (15). Check
clutch ring (9) and sleeve (8) for scoring or excessive wear. Check o-ring (26). Replace if necessary.
4. Remove nipple (2).
Check Quad Ring (25).
Replace if necessary.
5. Unscrew ball guide screw (6). Check o-ring (23). Replace if necessary.
6. Remove valve ball (3). Check for scratches, corrosion, and wear. Replace if necessary.
7. Remove seat assembly (4). Check condition of rubber seat. Replace seat assembly if necessary.
REASSEMBLY OF BALL VALVE
ILLUSTRATION DGC0100
1. Position ball (3) in body so ball guide screw (6) engages bottom of ball as it is screwed into position.
2. Put valve stem (7) into position. Make certain stem engages slot on top of ball.
3. Slip washer (15), spring (14), and clutch sleeve (8) over the stem. Place clutch ring (9) over the sleeve and secure with
the four (4) 1/4
NC x 5/8
socket head cap screws.
4. Set the two cam balls (12) into the V grooves in the clutch sleeve (8) and drop lever assembly over them. Tighten the
adjusting nut (16) so that approximately 1/8
play is left at the end of a 6
lever. Over tightening this nut will make the
clutch lock inoperative. Lock adjusting nut (16) with cap nut (20). Recheck this adjustment after valve is placed in
service.
5. Place seat assembly (4), seat o-ring (5), and quad ring (25) into position.
6.
Secure nipple (2) to valve body with eight (8) 1/4
NC x 5/8
socket head cap screws.
If more information is needed, call
W.S. DARLEY & CO.
at
Chippewa Falls, WI at 800-634-7812 or 715-726-2650
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