Installation, Operation and Maintenance Manual
󲷇H-A058-E-12󲷈 Diaphragm Valve, True Union Diaphragm Valve (15-50mm, 1/2”-2”) Pneumatic Actuated Type AI
9
- Tighten the bolts and nuts gradually with a torque wrench to the specified torque level in a diagonal
manner.
Recommended torque value Unit : Nm {kgfcm} [lbinch]
Nom. Size
15-20mm
(1/2”-3/4”)
25-40mm
(1”-1 1/2”)
50 mm
(2”)
PTFEPVDF
coated
17.5{179}[155]
20.0{204}[177]
22.5{230}[230]
Rubber
8.0{82}[71]
20.0{204}[177]
22.5{230}[230]
<True Union Diaphragm Valve>
- Take care not to over-tighten the Union Nut. (The valve can be damaged.)
- Do not use the pipe wrench. (The valve can be damaged.)
- When installing, disassembling, or reassembling the piping, fix the End Connector.
- Before a water test, be sure that the Union Nut is tightly fastened.
- Fasten the Union Nut while avoiding the parallelism and axial misalignment of the flange surface.
Threaded type
(Material : PVC, C-PVC, PP, PVDF)
- Avoid excessive tightening. (The valve can be damaged.)
- Make sure that the threaded connections are plastic x plastic. (Metallic thread can cause damage.)
- Wrap the threaded joints on our plastic piping with sealing tape. Using a liquid sealing agent or liquid
gasket may cause stress cracks (Environmental Stress Cracking). Our product warranty shall not apply
in case of said use, even when said use is unavoidable.
Sealing tape Strap wrench Spanner wrench
Procedure
1) Wind a sealing tape around the external thread of joint, leaving the end (about
3mm) free.
2) Loosen the union nut [26] with a strap wrench.
3) Remove the union nut [26] and the end connector [25c].
4) Tighten the external thread of the joint and the end connector [25c] hardly
with hand.
5) Using a spanner wrench, screw in the end connector [25c] by turning 180°
- 360°carefully without damaging it.
* Avoid excessive tightening. (The valve can be damaged.)
6) Make sure that the O-ring (C) [27] is mounted.
7) Set the end connector [25c] and union nut [26] directly on the body without allowing the O-ring (C) [27] to
come off.
8) Tighten union nut [26] on each valve until hand tight.
9) Using a strap wrench tighten union nuts uniformly on each side approx 90°- 180°turns, 1/4 to 1/2 turns.
* Take care not to over-tighten the Union Nut. (The valve can be damaged.)
Fig. 1
Necessary items
Caution
Caution
Caution
Sealing Tape
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