CLA-VAL 50-01 Manuals

Pressure Relief, Pressure Sustaining & Back Pressure Valve INTRODUCTION The Cla-Val 50-01/650-01 is an automatic control valve designed to maintain constant upstream pressure to close limits. It is a hydraulically operated, pilot controlled, modulating type valve. It is used where pressure relief or pressure sustaining functions in a bypass system are required. The valve is actuated by inlet line pressure, opening to maintain a steady line pressure and closing gradually to prevent surges. When inlet pressure is below the pressure setting CRL pilot control, the main valve and pilot are closed drip tight. Pressure setting adjustment is made with single adjusting screw that has a protective cap to discourage tampering. INSTALLATION 1. Allow sufficient room around the valve assembly to make adjustments and for servicing. 2. lt is recommended that gate or block valves be installed to facilitate isolating valve for preventative maintenance. When used as a surge control or pressure relief valve where valve outlet dis- charge is to atmosphere, then a gate or block valve is needed at valve inlet. When used as a back pressure sustaining control valve where valve outlet is connected to pressurized downstream system, then gate or block valves are needed at valve inlet and outlet. NOTE: BEFORE THE VALVE IS INSTALLED, PIPE LINES SHOULD BE FLUSHED OF ALL FOREIGN MATTER. 3. Place valve in line with flow through valve in direction indicated on inlet plate or flow arrows. Check all fittings and hardware for proper makeup and verify that no apparent damage is evident. 4. Cla-Val Valves operate with maximum efficiency when mounted in horizontal piping with the cover UP; however, other positions are acceptable. Due to size and weight of cover and internal components on six inch and larger valves, installation with the cover up is advisable. This makes periodic inspection of internal parts readily accessible. 5. Caution must be taken in the installation of this valve to insure that galvanic and/or electrolytic action does not take place. The proper use of dielectric fittings and gaskets are required in all systems using dissimilar metals. OPERATION AND START-UP 1. Prior to pressurizing the valve assembly make sure the nec- essary gauges to measure pressure in the system, are installed as required by the system engineer. A Cla-Val X101 Valve Position Indicator may be installed in the center cover port to pro- vide a visual indication of the valve stem position during startup adjustment. CAUTION: During start-up and test a large volume of water may be discharged downstream. Check that the downstream venting is adequate to prevent damage to personnel and equip- ment. All pilot adjustments should be made slowly in small increments. If the main valve closes too rapidly it may cause surging in upstream piping. 2. If isolation valves (B) are installed in pilot system open these valves (see schematic). 3. Loosen jam nut on X42N-2 strainer valve assembly and turn adjusting stem clockwise until it seats. Then turn stem counter- clockwise 1/4 to 1/2 turn and tighten jam nut for an initial setting. 4. Remove cap on the CRL Pressure Relief Control, loosen jam nut and turn adjusting screw clockwise until spring is fully com- pressed. This puts the control in full closed mode and will cause the main valve to close when system is pressurized. 5. If a downstream block valve is installed, slowly open this valve. 6. Partially open upstream block valve. The main valve should close. 7. Carefully loosen the plug at top of indicator assembly. If an indicator (X101) is installed, loosen the bleed valve at top of indi- cator. Bleed air from cover and tighten plug or bleed valve. Carefully loosen tubing fittings at highest points and bleed air from system. Retighten fittings. 8. Open fully the upstream block valve and turn the CRL adjusting screw slowly counterclockwise until you begin to hear a flow through the control. The main valve should start to open. If the pressure is below the required relief setting, refer to the spring chart and turn the adjusting screw clockwise the number of turns required for the proper setting. Lock the jam nut and replace cover. An observation of the pressure relief setting should be made during usage. The controls can be readjusted as required. MAINTENANCE 1. Cla-Val Valves and Controls require no lubrication or packing and a minimum of maintenance. However, a periodic inspection schedule should be established to determine how the fluid is affecting the efficiency of the valve assembly. Minimum of once per year. 2. Repair and maintenance procedures of the Hytrol Main Valve and control components are included in a more detailed IOM manual. It can be downloaded from our web site (www.cla-val.com) or obtained by contacting a Cla-Val Regional Sales Office. 3. When ordering parts always refer to the catalog number and stock number on the valve nameplate. INSTALLATION / OPERATION / MAINTENANCE 50-01/650-01 MODEL SYMPTOM PROBABLE CAUSE REMEDY Main valve Inlet pressure below setting of Reset pilot valve. If change won't open pilot valve in setting is from tampering, seal cap with wire and lead seal Pilot valve stuck closed Mineral Disassemble control and clean deposit or foreign material between disc retainer and power unit body Pilot valve diaphragm ruptured or Disassemble and replace diaphragm nut loose. Water coming diaphragm Tighten nut out of the vent hole in cover Main valve stuck closed Disassemble main valve, clean Mineral buildup on stem parts and/or replace damaged Stem damaged part. Check downstream and cover CK2 isolation valves are open Main valve Inlet pressure above setting of Reset pilot valve won't close pilot valve Clogged needle valve or strainer Disassemble and clean Pilot valve stuck open. Mineral Disassemble and clean deposit or foreign material under disc retainer or under diaphragm assembly Main valve stuck open. Mineral Disassemble and clean buildup on stem. Foreign material between seat and disc assembly Main valve diaphragm worn Disassemble and replace Valve leaks Pilot valve disc worn out Disassemble and replace Continuously Main valve disc worn or small Disassemble and replace pin hole in main valve diaphragm Set point too close to inlet pressure Reset CRL Pilot Distributed By: M&M Control Service, Inc. www.mmcontrol.com/claval-index.php 800-876-0036 847-356-0566