172-65254MA-04 (A-COS-10) 22 Apr 2020
5
Correct Usage of the A-COS Pressure Reducing Valve
Install properly and DO NOT use this product outside the recommended
operating pressure, temperature and other specification ranges.
Improper use may result in such hazards as damage to the product or
malfunctions which may lead to serious accidents. Local regulations
may restrict the use of this product to below the conditions quoted.
CAUTION
1. The product should be operated only within its specifications.
2. Installing an ON-OFF Valve (Solenoid Valve or Motorized Valve)
If an on-off valve, such as a motorized valve, is required, install it at the inlet side
of the product. If a solenoid valve is installed at the outlet of the product, its
opening and closing will cause heavy chattering and may lead to damage of the
piston and main valve. (When the on-off valve opens, the secondary pressure of
the product changes from zero to the set pressure. Passing through an area of
the reducing ratio of less than 10:1, where adjustment is impossible, chattering
occurs momentarily.)
NOTE: To prevent water hammer, it is recommended that a slow-acting
motorized on-off valve be used. In particular, if a fast-acting on-off
solenoid valve is used for frequent temperature control, the potential
water hammer effect can damage the air-using equipment and the
product.
Inlet Side
Motorized
Valve
A-COS
Outlet Side
A-COS
Solenoid
Valve
3. Installing a Safety Valve and a Control Valve
Safety
Valve
A-COS
Control
Valve
Air-using
Equipment
A-COS
Control
Valve
Safety
Valve
Air-using
Equipment
When installing a safety valve to protect the air-using equipment, be sure to
install it on the air-using equipment or directly before the inlet of the air-using
equipment. If the safety valve is installed on the outlet side of the product
between the product and a control valve, an eventual pressure rise could
activate the safety valve.
