Installaon, Use and Maintenance RD10‐RA10‐en Rev.08/2018
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Our products are manufactured under ISO-9001 Quality Assurance System, approved by CSQ certified under nr.9190.OMC2 - FIRST ISSUE 1994/08/04
ENGLISH
2.0 INSTALLATION
All works must be performed and supervised by skilled, trained and competent personnel.
The OMC valves highlight the flow direction, the nominal passage, the maximum operating pressure and the
material. Before installing the valve, make sure that the pipe which channels the process fluid is clean, by
performing, if required, an energetic blowing with steam or compressed air.
The OMC pressure reducers have been specifically designed for use on steam, water,
compressed air, industrial inert gases and other fluids included in Group 2 of the Pressure
Equipment Directive 2014/68/EU.
The reducer must be vertically installed on a horizontal pipe.
For any use of fluids with a temperature lower than 90°C the reducer can be installed with its head pointed either
upward (Pic.1) or downward (Pic.2). For any use with steam or fluids with a temperature higher than 90°C, the
reducer must be installed with its head pointed downward and its water seal pot installed on the line downstream
the reducer by making sure to respect the distances and the pressure pipes shown in Pic.2. During the start-up,
slowly open the "7" shut-off valve upstream to prevent any possible water hammer.
2.01 INSTALLATION OF THE VALVE ON THE PIPE
To ensure a uniform load and a uniform alignment, the flange bolts must be gradually tightened in criss-cross
sequence, as shown in Pic.D (paragraph 4.02)
Prevent any excessive tightening. Use the recommended tightening torques.
Prevent any pipe misalignment.
2.02 PRESSURE PIPE (Pic.1 and Pic.2)
The line of the actuator’s signal must be directly connected to the downstream pipe.
To obtain a good adjustment signal the downstream sensitive point must be far at least 1 meter or 15 times the
diameter of the pipe from the reducer "3" or from changes in the flow direction.
The pipe "4" of the actuator’s signal must be made of copper or stainless steel, its diameter must be equal to 8mm
and its minimum length must be 1m .
2.03 PRESSURE GAUGES (Pic.1 and Pic.2)
To activate the reducer "3" and keep the operating conditions under control you must install a pressure gauge "2"
both upstream and downstream "6".
2.04 SHUT-OFF VALVES (Pic.1 and Pic.2)
To ensure future maintenance operations on the reducer "3" you should install a shut-off valve "1" upstream and a
7" one downstream the reducer.
2.05 SAFETY VALVE (Pic.1 and Pic.2)
It's recommended that an appropiate safety valve "5" on the downstream side in order to protect the plant from
any overpressure. The valve "5" must be set to open at a lower pressure than the safety of the equipment and
dimensioned to discharge the entire reducer capacity "3", if it fails in the fully open position. The safety valve
outlet pipe must be discharged in a safe and secure place.
Pic. 1
