172-65169MA-08 (MC-COS Multi-control Valve) 28 May 2010
6
Correct Usage of the
MC-COS
Multi-control 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 MC-COS 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 to stop supply of steam
to the steam-using equipment, install it at the inlet side of the MC-COS. If a
solenoid valve is installed at the outlet of the reducing valve, 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 multi-
control valve 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.)
To save energy, install the on-off valve as near to the boiler as possible.
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 steam equipment and the multi-control valve.
3. Installing a Control Valve
MC-COS
MC-COS
A control valve (i.e. for temperature control) installed between the MC-COS and
the steam equipment (downstream of the MC-COS) may raise the pressure
between the MC-COS 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 steam equipment. Also, a safety valve should be installed
downstream of the control valve.
Note: When installing a safety valve to protect the steam equipment, be sure to
install it on the steam equipment or directly before the inlet of the steam
equipment. If the safety valve is installed between the MC-COS and a
control valve, an eventual pressure rise could activate the safety valve.
Motorized
Valve
MC-COS
Solenoid
Valve
MC-COS
Inlet Side
Outlet Side
MC-COS
MC-COS
Safety
Valve
Control
Valve
Equipment
Equipment
Control
Valve
Safety
Valve
