MANUAL OPERATED CRYOGENIC GLOBE VALVE

Transcription

1 INITIAL AND DATE NUMBER PREPARED CAR RELEASE DATE CHECKED JHM /22/96 ENGINEER SLH APPROVED JGP N/C 1 OF 8 LTR REVISION RELEASE DATE INITIAL AND DATE CHGD CHKD ENGR APPD

2 N/C 2 OF 8 Operation 1. The operator and valve have been preadjusted to insure bubble-tight shut-off of the valve at the seat to the customer-supplied design pressure rating. No further adjustments should be required. 2. All moving and contacting parts have closely held tolerances for free operation. The seal seat is a replaceable Neoflon PCTFE M-400H (formerly known as Kel-F) for positive shut-off. The bonnet O-Ring seals and the seal seat are the only replaceable wear items. The valve is designed to operate smoothly under all cryogenic conditions. Maintenance 1. With proper care, the Valve Assembly should require very little maintenance; however, as with all cryogenic equipment, thorough inspection of the system should be performed periodically to ensure continued, reliable operation. 2. O-Rings (6, 7) can be replaced by following the installation instructions for removing the actuator, and then by removing the Gland Nut (5) from Valve Stem (2) by turning gland nut counterclockwise and sliding it off the valve stem. Remove O-Rings (6, 7) from gland nut, taking care not to damage O-Rings during removal. Inspect O-Rings for damage such as nicks, scratches or tears. Replace as needed. Clean O-Ring grooves and replace in reverse assembly order after applying a very thin film of Halocarbon 25-5S or Krytox Grease to O-Rings. Bonnet O-Ring (10) can be inspected and replaced using installation instructions. 3. The Neoflon PCTFE M-400H Seal Disc (13) can be replaced by following the installation instructions for removal of the valve bonnet and barrel. To remove the seat seal for replacement simply press thumb against the open slot in the Kel-F seat while holding the barrel rigid. Very slight pressure should snap the seat seal from the barrel. Replace the seat seal and reassemble in reverse order. CAUTION: Assembly contains equipment plated with nickel. Cleaning with acids or other caustic solutions will remove plating and void warranty. Questions Contact: 2111 Builders Place Columbus, OH TEL (614) , FAX (614)

3 N/C 3 OF 8 (Continued) Installation Removal of Actuator 1. Support valve and actuator. 2. Remove actuator by removing Actuator Mounting Jam Nut (4). Loosen Stem Jam Nut (17). Carefully supporting actuator, unscrew Valve Stem (5) counterclockwise completely from actuator stem. At this point the actuator should slide completely off valve by lifting upward vertically. Removal of Barrel and Valve Seat 1. Support Valve 2. Remove Bonnet Bolts (10) and lift bonnet upward vertically until Valve Stem (5) can be removed from slot in Barrel (12). 3. Remove barrel and seat assembly from valve body; Care should be taken not to drop barrel and seat assembly onto valve body as the Neoflon PCTFE M-400H (formerly known as Kel-F) seal seat could be damaged. 4. Remove O-Ring (11) and store in a clean are until ready for reassemble. Installation in Process Line 1. Prepare connection on equipment on which valve will be installed. 2. Position Valve Body (14) to equipment and weld into place. (Weld per customer approved welding procedure). NOTE: All valve bodies are 304L Stainless Steel. Care should be taken not to over-heat valve body beyond that required for normal welding. When the valve is to be installed in a vacuum jacketed system, care should be taken not to introduce welding stress between the vacuum jacket and valve assembly, and to prevent forces on the bonnet of the valve caused by differential contraction rates (thermal loads) between the inner process line and the vacuum jacket.

4 N/C 4 OF 8 (Continued) Inspection of Weld Joints 1. Dye penetrant or radiograph check process line weld joint per customer approved procedure. 2. Pneumatic or hydrostatic pressure test inner line to specified test pressure per customer approved procedure. If hydrostatic test is used demineralized water is suggested as testing fluid. All traces of testing fluid are to be removed from pipes, valves, flex, etc. prior to proceeding. Re-assembly of Barrel and Seat Assembly 1. Allow valve body to cool after welding, ensure all testing fluids have been removed form valve. 2. Clean O-Ring (11) and O-Ring groove. Apply a very thin film of Halocarbon 25-5S or Krytox Grease to O-Ring and replace in groove. 3. Slide Valve Stem (5) into Barrel Slot (12) and slide assembly down into valve body. Replace Bonnet Bolt (10) and tighten to 150 inch Lbs. of torque. Re-assembly of the Actuator 1. It may be necessary to apply a temporary loading pressure to the actuator to move the actuator stem away from the valve during installation. CAUTION: When placing the actuator with loading pressure applied, use caution to keep hands and tools from between the actuator stem and the valve stem. If loading pressure is disconnected, personal injury may be possible if caught between actuator stem and valve stem. 2. Slowly lower the actuator down on to the valve. As the actuator yoke passes over the Valve Stem (5), place the Actuator Jam Nut (4) over the stem. 3. Continue to lower the actuator while guiding the Valve Stem (5) into the actuator stem (NOTE: At this point, it may be necessary to screw the valve stem into the actuator stem to allow the actuator yoke to seat properly onto the Valve Bonnet (9). If this is done, screw valve stem as far as possible into actuator stem to allow for seat adjustment later on). 4. Screw the Actuator Jam Nut (4) onto the Valve Bonnet (9) and tighten.

5 N/C 5 OF 8 (Continued) Readjusting Fail Closed Valve 1. Temporarily apply loading pressure to move actuator stem in upward position. 2. Loosen Valve Stem Jam Nut (17) and screw valve stem up into actuator. 3. Remove loading pressure from actuator allowing valve stem to move down into valve. 4. Screw Valve Stem (5) counterclockwise to move stem downward into valve. This should be done until resistance is met. (This should be the valve seat Kel-F coming into contact with the valve seat in the casting). 5. Supply loading pressure once again to the actuator to lift the valve stem upward. 6. Screw the Valve Stem (5) 2 complete rotations counterclockwise adjusting the valve stem downwards, then snug Valve Stem Jam Nut (17). 7. Remove loading pressure from actuator, then actuate actuator 4 to 5 times. 8. Check valve seat sealing by applying pressure to main process line to insure bubble-tight shut-off. At this point, valve should be ready for service. (If valve does not seat bubble-tight continue to next step). 9. Apply loading pressure once again to the actuator to lift the valve stem upwards. 10. Loosen stem jam nut and screw the valve stem (1) complete rotation counterclockwise adjusting the stem downward, then snug stem jam nut and remove loading pressure. 11. Actuate actuator 4 to 5 times and recheck valve bubble-tight shut-off. (This process can be used for a maximum of 3 times). If valve does not shut-off bubble-tight at this point, please contact your nearest PHPK representative.

6 N/C 6 OF 8 (Continued) Readjusting Fail Open Valve 1. Remove any loading pressure from actuator to allow actuator stem to move in upward position. 2. Loosen Valve Stem Jam Nut (17) and screw valve stem up into actuator. 3. Apply loading pressure to actuator allowing valve stem to move down into valve. 4. Screw Valve Stem (5) counterclockwise to move stem downward into valve. This should be done until resistance is met. (This should be the valve seat Kel-F coming into contact with the valve seat in the casting). 5. Remove loading pressure once again from actuator to lift the valve stem upward. 6. Screw the Valve Stem (5) 2 complete rotations counterclockwise adjusting the valve stem downwards, then snug Valve Stem Jam Nut (17). 7. Apply loading pressure to actuator, then actuate actuator 4 to 5 times. 8. Check valve seat sealing by applying pressure to main process line to insure bubble-tight shut-off. At this point, valve should be ready for service. (If valve does not seat bubble-tight continue to next step). 9. Remove loading pressure once again from actuator to lift the valve stem upwards. 10. Loosen stem jam nut and screw the valve stem (1) complete rotation counterclockwise adjusting the stem downward, then snug stem jam nut and remove loading pressure. 11. Actuate actuator 4 to 5 times and recheck valve bubble-tight shut-off. (This process can be used for a maximum of 3 times). If valve does not shut-off bubble-tight at this point, please contact your nearest PHPK representative.

7 PHPK PHPK Spare Parts List TECHNOLOGIES INCORPORATED 535 ENTERPRISE DRIVE WESTERVILLE, OHIO PHONE: (614) FAX: (614) ¼" OD - 1" OD Tube Size Remote Operated Valve Pressure Rating 150 PSI WOG [1]

8 PHPK PHPK Item No. PHPK Part Number Spare Parts List TECHNOLOGIES INCORPORATED 535 ENTERPRISE DRIVE WESTERVILLE, OHIO PHONE: (614) FAX: (614) Qty. Rec. ¼" OD - 1" OD Tube Size Remote Operated Valve Pressure Rating 150 PSI WOG [1] Description PHPK Tube Size Actuator Breather Vent Actuator Adapter, Remote Jam Nut, Actuator Valve Stem, Remote Gland Nut *2 O-Ring *1 O-Ring Bonnet, Remote Bonnet Bolt (Niflor coated) *1 O-Ring Barrel Assembly (Niflor coated) *1 Seal Disc Neoflon PCTFE M-400H (2) 14 1 Valve Body 15 FAS Hex Head Cap Screw 16 FAS Lock Washer, Split 17 FAS Jam Nut Valve Soft Goods Spare Parts Kit * These items are recommended spare parts and are available in the kit P/N (1) Valves individually tested to customer rated pressure, all valves not tested to maximum working pressure. (2) Formally Kel-F 81