Series 2700A
O
PERATING AND
M
AINTENANCE
ANUAL
Series 2700A Control Valve
Engineered
Performance
Страница 1: ...Series 2700A OPERATING AND MAINTENANCE MANUAL Series 2700A Control Valve Engineered Performance ...
Страница 2: ...alve Disassembly Balanced Cage Control Trim 4 2 4 Trim Inspection 5 2 5 Trim Restoration 5 2 6 Replacement of Teflon V Ring Packing 5 2 6 Replacement of Valve Compression Packing 6 2 7 Packing Lubrication 6 2 8 Valve Reassembly Balanced Plug Control Trim 6 2 8 Valve Reassembly Reduced Unbalanced Plug Control Trim 7 2 8 Valve Reassembly Balanced Cage Control Trim 7 2 8 Valve Reassembly Reduced Bala...
Страница 3: ...luid is moving either up or down The fluid pressure drop will occur at the cage s port The curve on the cage will signify the flow as linear or equal percent Norriseal valves come standard with spring diaphragm pneumatic actua tors These actuators are available in spring closing or spring opening types and are both available in a range of sizes to suit your operating conditions Series 2700A valves...
Страница 4: ...ise to increase the spring s preload and turn it counterclockwise to reduce the preload Retighten the nut after adjustment NOTE In a direct setting any increase in pressure may produce an increase in plug seating force when the valve is closed Do not exceed 55 psi supply pressure Stem travels for valves with full size trim are listed below For valves with reduced or restricted trim stem travel may...
Страница 5: ...as high pressure drop corrosion or fluid with sand Inspect bonnet once a year or whenever trim inspection is done The body should last many years under normal conditions However under severe conditions of corrosion or erosion from sand in the flowing fluid high pressure drops or high fluid velocity body life may be greatly reduced Inspect the body each time the bonnet is removed Inspect packing at...
Страница 6: ...oll pin securing the plug to the stem adapter Unscrew the plug by turning counterclockwise Lift the seat cage and seat adapter out of the body Separate the adapter from the seat cage by pulling downward to overcome the O ring friction If necessary the stem adapter may be removed from the valve stem by first driving out the roll pin and unscrewing the adapter from the stem FOR 3 0 AND 4 0 VALVE BOD...
Страница 7: ...f seat and plug Seat shall have a circular uninterrupted lap band approxi mately 1 32 to 1 16 in width at the base of seating chamber The plug will have a definite continuous lap band approxi mately 1 32 to 3 32 in width without being grooved The finished lap areas of seat and plug will have a smooth close grained dull appearance with no skips or tears Wash the plug and seat in sol vent to remove ...
Страница 8: ...ts Install the new packing and parts in the following sequence a Lower packing washer b Three packing rings c Lantern ring d Six packing rings e Packing retainer f Packing compressor bar g Two 3 8 nuts Replace the valve plug stem assembly and install the bonnet on the body using new gaskets Compress the packing by tightening the two 3 8 nuts If the compressor bar bottoms out on the bonnet when the...
Страница 9: ... Mount the bonnet and trim assembly onto the body Tighten the bonnet to body bolts to the recommended torques given in Table 4A or 4B which identifies valve size and recommended torque valves in foot pounds Tighten the nuts in across pattern in 25 50 75 and 100 increments of the final torque values Mount the diaphragm on the bonnet and connect the diaphragm stem to the valve stem 2 8 Valve Reassem...
Страница 10: ...to the valve stem 2 8 Valve Reassembly Reduced Balanced Cage Control Trim NOTE The reassembly procedure for reduced cage control trim is the same as for full size trim except for the following additional steps required to re install the seat adapter in the valve body Begin by performing Steps 1 through 7 above for full size trim Next install a new gasket in the Page 8 of 12 Install the new seat ga...
Страница 11: ... Table 4B Final Bolt Torques for Stainless Steel Bodies all values are in Foot Pounds Table 4A Final Bolt Torques for Carbon Steel Bodies all values are in Foot Pounds Page 9 of 12 10 00 Stud Size Torque 1 12 435 1 12 435 1 12 435 1 12 435 1 12 435 1 12 435 12 00 Stud Size Torque 10 00 Stud Size Torque 1 12 435 1 12 435 1 12 435 1 12 435 1 12 435 1 12 435 12 00 Stud Size Torque ...
Страница 12: ...tuator Foreign object interfering with plug to seat contact Plug and seat contact surfaces may be worn or damaged Some or all bonnet studs may be loose Body bonnet gasket may be worn or damaged Stem packing is worn or loose Replace stem Remove upper diaphragm housing Inspect the diaphragm and replace if necessary Remove upper diaphragm housing Inspect the plate to stem connection and tighten if lo...
Страница 13: ...2700A 2015 February 2015 P O Box 40525 Houston Texas USA 77240 0525 Tel 713 466 3552 Fax 713 896 7386 www norriseal com OPERATING AND MAINTENANCE MANUAL Series 2700A Control Valve Page 11 of 12 Notes ...
Страница 14: ... Houston Texas USA 77240 0525 Tel 713 466 3552 Fax 713 896 7386 www norriseal com 2700A 2015 February 2015 OPERATING AND MAINTENANCE MANUAL Series 2700A Control Valve Page 12 of 12 This page intentionally left blank ...
Страница 15: ...2015 February 2015 P O Box 40525 Houston Texas USA 77240 0525 Tel 713 466 3552 Fax 713 896 7386 www norriseal com OPERATING AND MAINTENANCE MANUAL Series 2700A Control Valve This page intentionally left blank ...
Страница 16: ...N G P L A N T A N D S A L E S www norriseal com 11122 West Little York Houston Texas 77041 T 713 466 3552 F 713 896 7386 Due to the continuous improvement at Norriseal specifications and or prices are subject to change without notice or obligation ...
