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Summary of Contents for CSA XLC 420
- Page 1 CSA waterworks line Upstream pressure sustaining/relief pilot operated automatic control valve Mod. XLC 420 Rev. 1 – 12/2014...
- Page 2 This manual will provide you with the information to properly install and maintain CSA automatic control valves XLC 400 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.
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Page 3: Table Of Contents
XLC 420 Contents Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4... -
Page 4: Description
XLC 420 Description The pilot operated control valve XLC 400 series Mod. 420 is designed to automatically sustain and relief a upstream pressure value, regardless of variation in demand and upstream pressure fluctuations. Picture 1 For further information please consult us at: www.comeval.es... -
Page 5: Handling And Storage
XLC 420 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. -
Page 6: Installation
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 downstream and upstream. This to avoid the accumulation of air pockets during working conditions, allow air discharge during pipe filling and entrance in case of pipe burst and draining. -
Page 7: Set Up
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. -
Page 8: Fusion/Powder Coated Valves
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. -
Page 9: Disassembly
XLC 420 MSM – Upstream pressure sustaining/relief pilot The upstream pressure sustaining/relief pilot is a diaphragm operated valve, spring loaded and direct acting, that can be installed basically in any position. The function is nothing but to sustain or relief the upstream pressure regardless of flow rate and pressure variations. - Page 10 XLC 420 4- Separate the intermediate body (29) from the lower body (22) paying attention not to damage the o-ring (30) 5- Check the surface of the seat (31) making sure it hasn’t been damaged or scratched 6- Holding the gasket container (39), using an aluminum vise or with buffers in order not to damage or scratch the material, with a monkey wrench 13 unscrew the tightening nut (12) to remove the upper flat (10) and the diaphragm (11).
- Page 11 (Integrated Group Filter Orifices) is a CSA unit flow control device that includes all the necessary functions, needed for the proper regulation and stability of the main valve. Its compact design makes the entire circuitry easy to be maintained, simple and intuitive yet allowing a tremendous range of regulations compared to other solutions on the market.
- Page 12 XLC 420 - replaceable check valves placed upstream of every regulator to limit the flow and control the acceleration during the valve opening and closing. - an upstream outlet not filtered protected by a cap 1/8 G - an upstream pressure outlet filtered, 1/8 G, protected by an air valve.
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Page 13: Interventions On The Main Xlc 400
XLC 420 Interventions on the main XLC 400 valve Component Material Body GJS 450-10 or GJS 500-7 GJS 450-10 or GJS 500-7 Position indicator St. steel/Ni-plated brass Pressure outlet tap AISI 316 Upper flat o-ring NBR/EPDM/Viton Obturator o-ring NBR/EPDM/Viton Indicator stem... -
Page 14: Troubleshooting
XLC 420 Problems solving Problem Cause Solution The main valve doesn’t The gate valves are closed Open the gate valves close The ball valves of the circuit are Open the ball valves closed There is no pressure inside Check the pressure coming... - Page 15 XLC 420 1) Checking the diaphragm In order to verify if the diaphragm has suffered any damage simply proceed as follows: a) slowly close the upstream and downstream gate valves; b) close all the ball valves of the circuit; c) completely open the air vent valve from the position indicator, if the latter is not present the fitting of the isolation valve on the chamber;...
- Page 16 XLC 420 The clogging can be located between the seat and obturator if the indication rod is in closed position and the flow continues, or between the sealing seat and cap if the valve does not reach the complete opening. Before proceeding to dismantling the cover, it is suggested to do some manual opening and closing operations putting the main chamber under pressure and discharging it.
- Page 17 XLC 420 Disassembly As mentioned before make sure that the gate valves upstream and downstream of the valves have been properly closed and set tight. Relieve the pressure of the main chamber simply by closing the isolation valves of the circuit and opening one of its fittings.
- Page 18 XLC 420 Reassembly To reassemble do the reverse of the disassembly procedure positioning the main shaft back into the grip along with all the pieces. It is very important not to forget the O-Ring (21) and to set the nut tight (10) to assure a proper torque between the diaphragm and the plane gasket. Please be extremely careful with this step because a nut not properly tight may engender movements making the mobile block unstable, therefore affecting the valve’s performance.
- Page 19 XLC 420 We reserve the right to incorporate our latest design and material changes without notice or obligation. Design features, materials of construction and dimensional data, as described in this manual, are provided for your information only.
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