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3. Installation
3.1 Cleanness of Piping
Before installing the valve in the line, clean piping and
valve of all foreign material such as welding chips, scale,
oil, grease or dirt. Gasket surfaces must be thoroughly
cleaned to insure leak-free joints.
3.2 Isolating By-Pass Valve
To allow for in-line inspection, maintenance and
removal of the valve without service interruption,
provide a manually operated stop valve on each side
of the control valve and a manually operated throttling
valve in the by-pass line.
3.3 Heat Insulation
In case of heat insulated installation, do not insulate the
valve bonnet and take protection measures related to
personal safety.
3.4 Hydraulic Test and Cleaning of Lines
During this operation, the control valve must not be used
as an isolating valve.
This means that the valve must always be opened before
carrying out pressure tests in the process line, cleaning of
pipes, etc., otherwise equipment damages or destroying
of seal rings could result.
3.5 Flow Direction
The valve must be installed so that the controlled
substance will flow through the valve in the direction
indicated by the flow arrow located on the body.
