CSA WATERWORKS GEMINA Series Manual de usuario
GEMINA
1
CSA waterworks line
Upstream pressure relief
Rapid acting valve
Mod. GEMINA
GEMINA
2
Introduction
This manual will provide you with the information to properly install and maintain CSA Rapid reacting
valves GEMINA series. 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 personnel only.
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 GEMINA series 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 for each components are listed on the respective assembly drawings
depicted on the following pages. 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 and
identification plate 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.
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.
GEMINA
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Contents
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Handling and Storage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
Set up - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9
Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
Guarantee - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15
GEMINA
4
Description
The fast-reacting valve GEMINA series which relieves the excessive upstream pressure when it
rises above the pre-set and adjustable value.
The valve must be placed in derivation from the main line, downstream of pumps and check valves.
A piped outlet has to be expected to discharge the excess of pressure caused by the pump failure
in order to guarantee the best protection of the system.
Note to the engineer: the valve does not have any effect in protecting the system against negative
pressure conditions coming from pump failures events, users is invited to send CSA pipeline profiles
and consider the installation of CSA combination anti surge air valves and/or CSA anti surge tanks.
GEMINA
5
GEMINA
6
GEMINA
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Handling and storage
Lifting the valve improperly may damage it and the equipments around. It is mandatory not to fasten
the valve around the circuit, fittings, pipes, solenoids or position indicators. Valves must be lifted only
by cables, chains, located around the body, through the flanges holes or eyebolts. During hoisting
always consider that the center of mass depends on the circuitry and pilots installed. If installation
will be delayed place the valve indoors in a secure watertight storage. Should that be unavailable
use a vermin proof rain cover around the valve to keep off rain, mud, humidity. Place the valve on a
solid and well drained surface base to prevent moisture, flood from reaching the body.
Maintenance
CSA Rapid reacting valve GEMINA series have been designed with a sturdy and reliable
construction to minimize servicing and possible malfunctioning. However, we recommend to inspect
them at least twice per year checking the plane gasket especially fir frequent usage. We recommend
a thorough inspection and maintenance with complete disassembly every 4 years.
Lifting the valve in the wrong way may cause malfunctioning, emission of water spurts,
injuries to the personnel and permanent damages of the valve.
GEMINA
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Installation (ref picture 1 on page 5)
The Rapid reaction valve GEMINA must be always installed in a vertical position. Gate valves or
other sectioning devices must be installed upstream and downstream of CSA control valves to allow
for maintenance.
•The operating fluid must be free of air, air valves (CSA Mod. FOX 3F AS combination anti-
slam) should be installed do upstream. This to avoid the accumulation of air pockets during
working conditions, allow air discharge during pipe filling and valves’ commissioning.
•If not included in the order install pressure gauges upstream (and downstream if necessary),
a flow measurement device is always recommended to make sure hydraulic conditions
remain within the values used for sizing.
•A Y strainer with average mesh grid should be installed upstream to protect internal
components from debris, particles and foreign material.
•Sufficient space should be provided around the valve for disassembly.
•Check direction of flow and make sure it is according to the marking on the valve’s casting.
•Make sure the flanges and pipes connection are according to the valve’s standard. The nuts
and bolts setting has to be conducted in the proper way, gradual and symmetrical, in order
not to produced additional stress and deformation.
GEMINA
9
Set up (ref picture 1 on page 5)
For the proper set up of GEMINA FF reader is advised to proceed as follows
•The valve is at first isolated from the main line with a sectioning device underneath, closed.
•The valve is provided with a male vertical threaded connection to the placed on then inlet
and female threaded connection, horizontal, the outlet.
•The purpose of the valve is to discharge any excess in pressure above a preset and
adjustable limit.
•The regulation screw (2) allows for the compression and decompression of the spring (4),
the more it is compressed turning clockwise the higher is the opening pressure and viceversa
•The setting should be always at least 1 bar above the maximum operating value of the system
•Compress the spring (4) almost completely by acting on the screw (2) turning it clockwise
•Open the isolation device below the Gemina valve
•Read the pressure on the pressure gauge and reach the maximum operating pressure
•Read the graph below showing the correspondence between the pressure and length of the
screw
Regulations has to be carried out slowly to avoid unwanted pulsations and pressure
surges. Failing in setting the upstream pressure relief will cause premature opening
and risk of depressurization and/or absence of opening when requested with risk of
damages to the system
The difference in pressure generated by the valve during the pressure relief function
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.
The set up and valve regulation has to be carried out by qualified personnel only, or
directly from CSA service. Improper actions can lead to permanent damages to the
valve, its internal components and system equipments along with possible injuries of
the people involved.
GEMINA
10
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