XLC 325/425
For further information please consult us at: www.comeval.es
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Regulations of pilots has to be carried out slowly to avoid unwanted pulsations and
pressure surges. Always leave enough time for the system to balance, in case of
doubts and problems allow for some flow through the by-pass to stabilize the line and
call CSA technical support.
downstream and on the variations in demands.
•Having generated the flow it means that the upstream pressure set point has reached the
incoming pressure value.
•Slowly act on the regulation screw on the pilot (6) turning it clockwise to limit the flow
increasing the upstream pressure to be sustained or anticlockwise to increase the flow
reducing the upstream pressure to be sustained , the variation in pressure depends on the
spring range used, and can vary from 0,47 bar to 0,95 bar per revolution with the most
common springs used. Please consult CSA for more details and for the regulation chart
expressing the setpoint versus the spring compression.
•Once the valve has reached the desired value set the locking nut and place the hood on top
of the pilot. Open the downstream gate valve completely then and check once again the
pressure gauge and the flow meters.
•The unit flow control device GR.I.F.O. (5) is exclusive from CSA and contains needle
valves, filter and check valves used for the proper valve’s stability and regulation. If present
do never change the settings before consulting with CSA technical support.
•The solenoid (9) is placed on top of a 2 ways flow accelerator (8) to allow for opening and
closing by means of the incoming pressure, obtain through signals. Valve can be supplied
normally open or closed depending on the flow and valve’s position in absence of power
supply.
•Needle valve (4) is used to adjust the main valve response time, the mode ir is throttle the
more restriction we will create on the flow going in and out of the chamber.
•Keeping it completely closed will prevent the valve from operating properly while leaving it
completely open will not dampen possible sudden rise in pressure during closure.
Maintenance
CSA automatic control valves XLC 400 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 releasing the air accumulated inside the bonnet and checking the
strainer inside the GR.I.F.O, if present, or placed as a separate entity in the circuitry. We
recommend a thorough inspection and maintenance with complete disassembly every 4 years,
according to the following instructions. The solenoid valves ate not a CSA products, they are tested
before supply, user is invited to read and understand the operating principle and make sure to
clean it and maintain the operating parts according to their specific indications (this could change
according to the brands chosen for the job).
