CSA VRCD-FF User manual

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CSA waterworks line
Direct acting downstream pressure
reducer-stabilizer in stainless steel
Mod. VRCD-FF

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Personnel involved in the installation or maintenance of valves should always be alert
to potential emission of water and pipeline material, and take the necessary safety
precautions. Always wear the suitable protection like helmets, gloves, googles, when
dealing and handling hazardous pipelines and valves.
Introduction
This manual will provide you with the information to properly install and maintain CSA direct acting
pressure reducers Mod. VRCD-FF entirely made in stainless steel. The contents and the
procedure are intended for technicians in charge of CSA valves only, prior to a theoretical and
practical training by CSA qualified or authorized personnel.
Safety
All safety messages in the instruction manual are flagged with the following symbol meaning
danger, caution and warning. This means and makes reference to procedures that may lead to
equipment and system damage and to severe injury or death for the personnel involved.
Inspection
Your valve VRCD-FF has been packaged to provide protection during shipment, however it can
be damaged during transport. Please carefully inspect the unit for damages or discrepancies with
the order upon arrival and report a claim immediately before unloading the goods.
Parts
Recommended spare parts are listed on the assembly drawing depicted on page 8.These parts
should be stocked to minimize delays in case of malfunction. All CSA products and spare parts
can be supplied by CSA official distributors or directly from CSA. When ordering spare parts
please make reference to the assembly drawing on this manual and to the indentification plate
with serial number present on the valve.
CSA Service
CSA service personnel are highly qualified to maintain and repair all CSA products, CSA also
offers customized training program and consultation services.
For more information please contact CSA or visit the web site www.csasrl.it constantly updated.

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Contents
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Handling and storage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -6
Set up - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6
Drawings- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -7
Problem solving - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - 8
Disassembly- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9
CSA guarantee and liability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --- - --11

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Personnel involved in the installation or maintenance of valves should be constantly
alert to possible damages caused by an improper handling of the valve.
Description
The automatic direct acting PRV Mod. VRCD-FF consists of a upstream pressure balanced single
seat globe pattern valve, piston actuated, and equipped with a spring located in the cover to impart
the force necessary for the proper working. By means of a compensation chamber the valve will
reduce and stabilize the downstream pressure regardless of variations in demand and upstream
pressure fluctuations. The operating principle is explained on the technical catalogue, for further
details please contact CSA and/or its local rep. The special design of CSA with built in self cleaning
piston technology guarantees long lasting performances with a dramatic reduction of the
maintenance time, minimizing the risk of friction and malfunctioning.
Handling and Storage
Lifting the valve improperly may damage it. Lift the valve with slings, chains or cables fastened
around the valve body. Do never lift the valve by the adjusting screw and by the threaded
connection. If installation will be delayed, place valve indoors in secure, weather tight storage. If
temporary outside storage is unavoidable, make sure a vermin proof rain cover is secured
around/over the valve to keep off rain and mud. Skid and set the assembly on a flat, solid, and well
drained surface for protection from ground moisture, runoff and pooled rain water. Do not leave the
valve exposed to high humidity and excessive temperature conditions and do not remove the
plastic taps prior to the installation.

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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