Installa on, Opera on and Maintenance Manual KA30‐en Rev.04/2018
Page 5
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ENGLISH
2.0 INSTALLATION
All works must be performed and supervised by skilled, trained and competent personnel.
The fusion of the OMC valves’ body highlights the flow direction, 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 installation of a filter (pos. A Pic. 1) upstream the valve will prevent the entrance of any dirt in the plug.
To perform periodical maintenance operations of the valves installed on continuous-operation systems, it is
recommended to install two shut-off valves, located upstream (pos. B Pic. 1) and downstream (pos. C Pic. 1) of
the control valve, and a by-pass one (pos. D Pic. 1). Use the by-pass valve (pos. D Pic. 1) to manually regulate
the process when the control valve is temporarily disconnected. The two shut-off valves must have the same
internal diameter of the control valve. During the installation of the valve, make sure that the flow in the pipe goes
in the same direction as indicated by the arrow on the valve body.
Pic. 1 Installation diagram
D
A
B
C
E
The assembling position of the valve does not limit its operation, but it is recommended to assemble the valve
with the actuator pointed upward (pos. E Pic.1) as other positions might allow the accumulation of any impurities
which are contained in the fluid thus damaging the valve itself.
2.01 ASSEMBLY OF THE VALVE ON THE PIPE
To ensure a uniform load and a uniform alignment, the flange bolts must be gradually tighted in criss-cross
sequence, as indicated in Pic.2
Prevent any excessive tightening. Use the recommended tightening torques. Prevent any pipe
misalignment. Choose the flange gaskets according to the operating conditions.
ATTENTION!!! For valves with braze-on connections, the welding operation must be performed
only by qualified personnel and, in order to prevent any damages to the valves, keep the valve
body cold during the above-mentioned operation.
Pic. 2 Tightening sequence