Products >> Pinch Valve assembly & operating manual

 
Sr.No. Description Material Qty
15 Hex Bolt M.S. 1
14 KEY M.S. 1
13 CSK BOLT M.S. 2
12 GRUB SCREW M.S. 2
11 Travel Limit Nut M.S. 1
10 Hand Wheel C.I. – FG 200 1
9 Yoke Bush Gun Metal 1
8 Lug Clamp M.S. 4
7 Spindle Clamp Gun Metal 1
6 Spindle AISI-410 1
5 Elastomer Sleeve Reinforced Rubber 1
4 Tie Bar AISI 410 2
3 Bridge Cast Steel 1
2 Pinching Bar C.I. – FG 200 2
1 Main Body C.I. – FG 200 1


 
Operating Manual

Preliminary Precaution: Always keep pinch valves in fully open condition. Also check the position of the travel limit nut, if found loose then tighten the set screw of the nut.

Installation: Pinch valve can be installed without any gasket unless it is required for some specific purpose. Tighten the nut of the flanges evenly & equally, but avoid too much tightening. Ensure free movement of the upper & lower pinching bar by opening & closing the valve. The valve is then ready for the service.

Maintenance: If pinch valve is found leaking through the seat after sometime even though it is fully closed, then set the travel limit nut by just taking it 1 or 2 threads above & then tighten. This will allow more room for traveling of rubber sleeve & ensure the valve to zero leakage. This problem sometimes occurs when the sleeve is slightly worn out, under any abrasive condition. Further, The Rubber sleeve of the pinch valve upto 2” (50mm) have a single lug on either side and it goes into the hollow passage of the pinching bar where it is fixed with the lug clamping screws. In the higher sizes above 2”, the sleeves have two lugs on either sides and are fitted overlapping the pinching bar. These reinforced lugs help retraction of rubber sleeve even in vacuum service.

Dismantling the valve & replacing rubber sleeve / muff: When the rubber sleeve is ruptured or totally worn out then replace it with a new one. Dismantle the valve as mentioned below.

  • Remove the hand wheel.
  • Open the Tie Bar nuts.
  • Disconnect the spindle from the Horseshoe connection and remove it completely with the bridge.
  • REMEMBER not to temper the set screw of the yoke bush, unless required or should be completely tight.
  • Open & remove the nuts & bolts of the split body of the valve.
  • Remove the screw of the lugs from both the pinching bars.
  • Now fit the new rubber sleeve & reverse the operation to assemble the complete valve.

Remember: It is advisable to keep a spare rubber sleeve / muff for maintenance purpose, considering the self life of the Rubber as six months when wrapped with normal newspaper and stored in dark. The Pinch valves should be stored in fully open condition only. We also offer complete spares of our pinch valves hence our pinch valves shall never be scrapped. We sincerely request you to place your order 1-2 weeks in advance.
 

   
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Jaldhij Patel