COMPACT KNEE VALVE 172
Parts List and
5. SEAL RING
6. REGULATING SCREW
7. SEAL RING
9. SEAL RING
10. ‘U’ SEAL
11. SEAL RING
12. SPRING WASHER
15. CLAMPING NUT
16. CLAMPING WASHER
Parts 4a to 13 are available as individual items.
We can also supply the following pre assembled units:
172/4a-12 Spindle Assembly with Head
172/6-12 Spindle Assembly
172/Seal Kit – comprising seals 5, 9, 10 and 11
When ordering parts, please quote the valve number and then the item number. For example 172/10 for the ‘U’ Seal or 172/4a-12 for the Spindle Assembly with Head.
Note that Seal Ring 172/7 is only supplied fitted to the Regulating Screw 172/6.
TO ADJUST AGAINST CONCUSSION
- Keep water supply on.
- Insert a 3mm wide straight bladed screwdriver through the hole in the Spindle (8) and engage the Regulating Screw (6). Unscrew about 3 or 4 turns and operate the valve several times to clear air and foreign matter, which may have accumulated, from the Regulating Screw seating.
- Lightly screw the Regulating Screw fully clockwise. Operate the valve. Unscrew the Regulating Screw until the valve closes just slowly enough to prevent concussion in the supply pipe. This fitting is not designed as a time delay valve and as such the Regulating Screw should only be set to prevent concussion and no other delaying action to the valves closure.
IF THE REGULATING SCREW IS SCREWED DOWN TOO FAR OR BLOCKED, THE VALVE WILL DISCHARGE CONTINUOUSLY.
TO REMOVE FOREIGN DEBRIS FROM THE VALVE
If the valve starts to run continuously then it is possible that some foreign debris has fouled it. In many cases the quick and simple procedure detailed above will allow the debris to be cleared. If this does not work then carry out the following: –
- Insert a 3mm wide straight bladed screwdriver through the hole in the Spindle and engage the Regulating Screw. Unscrew and remove the Regulating Screw. Take care as a small amount of water may be discharged from the Spindle when the Regulating Screw is removed.
- Operate the valve a couple of times by pushing the Spindle inwards until its end is flush with the Head (4a). Do not push the spindle any further inwards. Again take care, as a small quantity of water will be discharged through the centre of the Spindle. This will help to flush out the debris that may be causing the blockage.
- Examine the ‘V’ groove in the end of the Regulating Screw and ensure that it is clear of debris.
- Refit the Regulating Screw into the Spindle and lightly screw fully home. Again operate the valve by pushing the Spindle inwards until its end is flush with the Head. Unscrew the Regulating Screw until the valve closes just slowly enough to prevent concussion in the supply pipe.
TO DISMANTLE FOR RE-WASHERING
- Turn off water supplies.
- Unscrew the Head (4a). Pull the Spindle (8) from the Body (14) while easing with a circular motion to the spindle.
- Unscrew the Regulating Screw (6) from the Spindle and ensure that the ‘V’ groove and Spindle are clear of debris.
- Replace seals if required, taking care to avoid scratching the locating grooves by using a non-metallic implement.
Re assembly is the reverse of the above dismantling procedure. Adjust against concussion as detailed above.