5
The difference in pressure generated by the valve when closed or during closing will
produce a thrust proportional to the pressure itself.
Anchorage blocks and way of preventing valve’s movement or shifting need to be
taken into account.
Installation
The direct acting PRV VRCD-FF should be installed in horizontal position, especially with if subject
to high differential pressure values. Vertical installation if not unavoidable is accepted and won’t
affect the PRV performances. The valve has to be installed between two sectioning devices, one
upstream and one downstream to allow for maintenance, with a filter upstream of it to prevent dirt
from creating malfunctioning. For the recommended flow rate and differential pressure please refer
to the sizing information displayed in the catalogue or contact CSA (or local rep) sending the
project data for further assistance and valve sizing.
Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from
the pipeline.
Prepare pipe ends and install valves in accordance with the pipe manufacture’s instructions
for the joint used.
Unless otherwise stated the CSA threaded connection are always in accordance with GAS
standard although it can be supplied with different specifications on request
Place the valve in the right direction following the arrow engraved on the body
If not included in the order install a pressure gauge upstream and downstream, to check the
maximum static and differential pressure reached during closing and make sure it doesn’t
exceed the valve’s design pressure
Note to Engineer:
The direct acting pressure reducing valve VRCD will regulate and
maintain a downstream pressure value according to the force of the spring, located inside
the cover, supplied with different regulation range according to the valve size and specified
in the catalogue
The spring range is usually indicated on the stainless steel identification plate and on the
order confirmation, should the pressure needed be out of the available range contact CSA
for an immediate replacement, do not exert excessive torque on the spring or relief it
completely