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5.2 Installing an ON / OFF Valve (solenoid valve or motorized valve)
If an on-off valve is required to stop the supply of steam or air to the equipment, install it on the
inlet side of the DR20/A-DR20. If a solenoid valve is installed at the outlet of the DR20/A-DR20, it
will cause heavy chattering and may lead to damage of the DR20/A-DR20. (When the on-off valve
opens, the secondary pressure of the DR20/A-DR20 changes from 0 to the set pressure, passing
through an area where the reduction ratio is less than 30:1, where adjustment is impossible,
chattering occurs momentarily). To save energy, install the on-off valve as near to the boiler or air
compressor as possible.
NOTE: To prevent water hammer in steam systems , it is recommended that a slow-acting
motorized on-off valve be used. If a fast-acting solenoid valve is used, the potential water
hammer effect can damage the steam equipment and the pressure reducing valve.
5.3 Installing a Control Valve and a Safety Valve
A control valve (i.e. for temperature control in steam systems) installed between the
DR20/A-DR20 and the equipment (downstream of the DR20/A-DR20) may raise pressure
between the DR20/A-DR20 and the control valve when the control valve is closed, depending on
their spatial relationship. Therefore, the control valve should be installed close to the equipment.
Also, a safety valve should be installed downstream of the control valve.
NOTE: When installing a safety valve to protect the equipment, be sure to install it on the
equipment or directly before the inlet of the equipment. If the safety valve is
installed between the DR20/A-DR20 and a control valve, an eventual pressure rise could
activate the safety valve.
5.4 Blowdown
Before installing the DR20/A-DR20 unit, be sure to blow down all piping thoroughly. If this is not
possible, perform a blowdown using the bypass valve. Blowdown is especially important for
newly installed piping or after the system has been shut down for a long period of time.
5.5 Remove Protective Seals
Before installation, remove the protective seals covering the product inlet and outlet.
5.6 Tolerance Angle for lnstallation
。
。
15
15
Make sure the DR20/A-DR20 is installed on horizontal piping with the
adjustment handle facing up. Ensure the raised TLV lettering on the body is
horizontal and the arrow is pointing in the direction of flow. The allowable
inclination of the DR20/A-DR20 is 10
DR20/
Safety
A-DR20
Valve
Steam or Air
using Equipment
。
front-to-back and 15
̶ 10 ̶
Control
Valve
。
horizontally.
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