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Related Manuals for Xylem Bell & Gossett Hoffman Specialty 2000 Series
Summary of Contents for Xylem Bell & Gossett Hoffman Specialty 2000 Series
- Page 1 INSTRUCTION MANUAL HS-601I 510549...
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Page 2: Planning The Installation
PLANNING THE INSTALLATION 11. Install pressure relief valves in accordance with local and national codes. The relief valve must be capable of passing the full capacity of the regulator with its Planning for the Main Valve Installation largest seat trim. 1. -
Page 3: Installation Detail
INSTALLATION DETAIL Main Valve Installation 10 Pipe Diameters 1. Connect a steam line (A) from the steam supply to the 13. Use compressed air or steam to clean piping before area where regulator valve is to be located. Install tee installing the regulator. - Page 4 Note: For heat exchanger shell applications, it is 19. Install the bypass piping and globe valve (T). recommended that the feedback line and pressure • Use the same size pipe for the bypass piping and gauge be installed directly into the heat exchanger globe valve in the bypass line as the main valve (N) shell.
- Page 5 1. L-Tube 9. J-Tube Cut L- tube to appropriate A & B dimensions listed on Tubing Length No cutting of J-tubes chart. is required No cutting is required if dimension is marked with an * . 2. S-Tube Cut S- tube to appro- priate C &...
- Page 6 Bleed Orifice The function of the bleed orifice is to bleed steam off the • Typical applications for 3/32 in (2.4mm) diameter main valve diaphragm when the pilot(s) close(s). A 1/16" bleed orifice may include: (1.6mm) diameter orifice is standard, and is installed in –...
- Page 7 Spring/Air Pilots Temperature Pilots CAUTION Spring Pilot Temperature pilot bulb will be immersed in the heated fluid. Before immersing, check compatibility of copper bulb with heated fluid. Failure to insure compatibility may cause property damage. Feedback Line Balance Tube Signal CAUTION System should be supplied with overheat protection Pilot Inlet...
- Page 8 Temperature and Spring Pilot Combination Pneumatic Temperature and Air Pilot Combination Spring Pilot 315 PNT Air Supply Temperature Pilot Self-Contained AP Air Temperature Pilot Pilot Temperature Sensor Feedback Line Signal Balance Pilot Inlet Tube Balance Tube Pilot Inlet Outlet Main Valve Inlet Bleed Outlet...
- Page 9 The following chart shows the maximum outlet steam the pneumatic temperature pilot to an AP-1A or AP-4A pressure that can be obtained from the main valve. The Pneumatic Pressure Pilot. Intermediate pressures can be outlet steam pressure is based on the air pressure from interpolated from the chart.
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Page 10: System Start-Up
SYSTEM START-UP 1. Make sure all strainer blow down valves are closed 7. Apply a small amount of force to the pilots. and capped to prevent accidental burns. Spring Gradually compress adjusting spring 2. Open 1/4 NPT feedback control line shut-off valve. by tightening adjusting nuts equally until the pilot valve opens. -
Page 11: Maintenance
ADJUSTING PILOTS Spring/Air Pilots • The calibrated temperature dial provides an approx- imate setting. If the temperature dial reading is Adjust spring/air pilot to control the system at desired slightly off from the thermometer reading, the dial pressure. The system pressure can be set for full steam should be recalibrated, as follows: or partial steam flow. -
Page 12: Troubleshooting
TROUBLESHOOTING Replace the regulator or pilot(s) when parts no longer Cause: Main valve undersized. operate properly. A new regulator is more economical Solution: Check valve capacity against system load. than replacing individual parts, and will provide greater Replace with correct size valve. reliability. - Page 13 MAIN VALVE TESTING All tests can be performed on main valve while it remains Test for Restricted Movement: installed in the steam system, if there are gate valves 1. Attach an air line containing a pressure regulating located upstream and downstream of the main valve. valve (PRV) and pressure gauge to the 1/8 NPT port located in the center of the lower diaphragm case of 1.
- Page 14 MAIN VALVE REPAIR • Heating the seat with a torch may be required for seat removal. 7. Coat the threads and lower edge of seat flange with a high temperature non-hardening sealant before installing a new seat. 8. Install a new seat. A new plug and seat will require lapping.
- Page 15 6. Inspect the valve seat and plug for deep scratches or 13. Replace top cover and stem guide (if used) using a deposits. Clean or replace if necessary. new gasket. Tighten the cover bolts to torque shown in the "Tightening Torque for Series 2000 Main Valve" 7.
- Page 16 PILOT VALVE TESTING AND REPAIR CAUTION Close all steam lines that could pressurize any of the valve chambers before disassembling the system. Use caution when opening any section or valve chamber as there may be hot condensate trapped inside. Failure to do so may result in burns.
- Page 17 SPRING PILOT REPAIR Disassembly 1. Isolate the main valve from the steam line. Make sure the internal pressure is 0 psig (0 bar) and allow the valve to cool to prevent injury. 2. Disconnect the copper tubing lines and feedback line. Disconnect the pipe union and remove the pilots from the main valve.
- Page 18 AIR PRESSURE PILOT Stem Projection "B" to be Air Pilot Quick Test Removed as per Instructions Gage 1. Isolate the main valve from the steam line. Make sure Prick Punch the internal pressure is 0 psig and allow the valve to cool to prevent injury.
- Page 19 Air Pilot Bench Tests • The pressure should respond smoothly. 1. Isolate the main valve from the steam line. Make sure • If the pressure changes each time or if the reaction the internal pressure is 0 psig and allow the valve to of the pressure gauge is jerky, the pilot valve cool to prevent injury.
- Page 20 Air Pilot Disassembly (cont’d) TEMPERATURE PILOT Temperature Pilot Testing 9. Inspect and clean all parts and gasket sealing areas. Replace any worn or damaged parts. • Reassemble using non-hardening sealant on the CAUTION plug threads. Before removing sensing probe, the system must be •...
- Page 21 Temperature Pilot Repair 1. Put pilot in vise with top up. Remove the bottom plug 3. Clean and inspect all parts, lap plug (9) and seat (2) (4). The strainer (8), spring (5) and button (6) should with 400 grit lapping compound. Replace if necessary. drop out when the bottom plug is removed.
- Page 22 Temperature Actuator Assembly Testing 3. Allow system temperature to stabilize at the desired 1. Loosen calibration set screw on indicator ring. Drop set-point temperature and normal load conditions. away from dial. Securely tighten the adjustment knob set screw. 2. Loosen Allenlock set screw on knob assembly. 4.
- Page 23 COMMERCIAL WARRANTY Warranty. For goods sold to commercial buyers, Seller warrants the goods sold to Buyer hereunder (with the exception of membranes, seals, gaskets, elastomer materials, coatings and other “wear parts” or consumables all of which are not warranted except as otherwise provided in the quotation or sales form) will be (i) be built in accordance with the specifications referred to in the quotation or sales form, if such specifications are expressly made a part of this Agreement, and (ii) free from defects in material and workmanship for a period of one (1) year from the date of installation or two (2) years from the date of manufacture, whichever shall occur first, unless a...
- Page 24 Xylem Inc. 8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.xylem.com/bellgossett Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries. © 2019 Xylem Inc. HS-601I June 2019 Part No. 510549...