Installation, Operation and Maintenance Manual
【
H-V063-E-9
】
Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type)
10
Flanged End
- Use flat faced flanges for connection to AV Valves.
- Ensure that the mating flanges are of the same standards.
- Be sure to use sealing gaskets (AV Gasket), bolts, nuts, and washers and tighten them to
specified torques. (When a non-AV gasket is used, a different tightening torque instruction
should be followed.)
● Torque wrench
● AV gasket
Procedure
1) Set the AV gasket between the flanges.
2) Insert washers and bolts from the pipe side, insert washers and nuts from the valve side, then
temporarily tighten by hand.
- The parallelism and axial misalignment of the flange surface should be under the values shown in
the following table to prevent damage the valve. (A failure to observe them can cause destruction
due to stress application to the pipe.)
Nominal size
Axial
misalignment
Parallelism
（a-b）
15-32mm
(
½
”-1
¼
”)
1.0mm
(0.04”)
0.5mm
(0.02”)
40，50mm
(1
½
”-2”)
1.0mm
(0.04”)
0.8mm
(0.03”)
3) Tighten the bolts and nuts gradually with a torque wrench to the specified torque level in a diagonal
manner.
4) Tighten it more than 2 turns clockwise with specified torque.
- Do not tighten above the specified torque value. (The valve can be damaged or leaks.)
Specified torque value
Unit：N-m｛kgf-cm｝ [ib-inch]
Nominal size
15mm
(
½
”)
20mm
(
¾
”)
25mm
(1”)
32mm
(1
¼
”)
40mm
(1
½
”)
50mm
(2”)
PTFE coted
PVDF coted
17.5
｛179｝
[155]
17.5
｛179｝
[155]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
22.5
｛230｝
[200]
Rubber
8.0
｛82｝
[71]
8.0
｛82｝
[71]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
22.5
｛230｝
[200]
* When union nut is loosened or removed, please install in the following way.
5) Make sure that the O-ring (C)[5] is mounted.
5) Set the end connector and union nut directly on the body without allowing the O-ring (C) to come off.
7) Tighten union nut on each valve until hand tight.
8) Using a strap wrench tighten union nuts[4] uniformly on each side approx. 90
˚
- 180
˚
turns, 1/4 to 1/2
turns.
Necessary items
Caution
Caution
（
Axial misalignment
）
（
Parallelism
）
b
a
Caution
