Installation,Operation and Maintenance Manual
H-V016-E-12 Gauge Valve 5
6. Installation procedure
- Be sure to conduct a safety check on all hand and power tools to be used before beginning work.
- Wear protective gloves and safety goggles as fluid remain in the valve even if the pipeline is
empty. (You may be injured.)
- When installing a pipe support by means of a U-band or something similar, take care not to
over-tighten. (Excessive force may damage the pipe.)
- When installing pipes and valves, ensure that they are not subjected to tension, compression,
bending, impact, or other excessive stress.
Flange part
- 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 Gauge pipe AV gasket
Procedure
1) 󲘀et 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)
20, 25mm (3/4󲤀, 1󲤀)
1.0mm (0.04 inch) 0.5mm (0.02 inch)
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.)
󲘀pecified torque value Unit ; N-m {kgf-cm} [lb-inch]
Nominal size 20mm (3/4󲤀) 25mm (1󲤀)
PTFE coted / PVDF coted 17.5 {179} [155] 20.0 {204} [177]
Rubber 8.0 {82} [71] 20.0 {204} [177]
Necessary items
Warning
Caution
Caution
Axial misalignment
Parallelism
b
a
Caution
Caution
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