Cryogenic Ball Valves - CEXI

1 Worcester Controls08164-SCryogenic ball ValvesInstallation, Operation and Maintenance Instructions1/4" 2" R5 AND EARLIER THREE-PIECE, BODIED EXTENDED BONNET1/4" 2" R6 AND EARLIER C4 THREE-PIECE BODIED NON EXTENDED BONNET3" 6" R12 AND EARLIER ONE-PIECE BODIED EXTENDED AND NON EXTENDED BONNET1/4" 2" R6 AND R7 C44 THREE-PIECE BODIED NON EXTENDED BONNETIMPORTANT: Valves intended for ammonia service must be ofstainless (not brass) material, with welded bonnet joint. The standardbonnet joint is brazed, not : Flowserve recommends that all products which must bestored prior to installation be stored indoors, in an environmentsuitable for human occupancy.

2 Do not store product in areas whereexposure to relative humidity above 85%, acid or alkali fumes,radiation above normal background, ultraviolet light, ortemperatures above 120 F or below 40 F may occur. Do not storewithin 50 feet of any source of INSTALLATIONA. The Worcester Cryogenic Valve is unidirectional for flow in onedirection only and therefore can only be installed in one the valve in the closed position, install it with the relief holein the ball on the upstream side to ensure that cavity relief isupstream. Note arrow stamped on the body, on a metal tagwelded to the body, or on the bonnet plate indicating flow The Worcester Cryogenic Diverter Valve must be installed with thebottom port on the upstream : DO NOT install Valves with extended bonnets withthe extension tilted more than 30 from the upright extended bonnet valve is designed to maintain stem seals atnormal ambient temperature.

3 Do not insulate the extension fully allow 3" 4" of tube to protrude above the To install Valves with welded, brazed or soldered pipe ends (BW, SW, SWO or TE):NOTES:Prior to welding or brazing, THOROUGHLY CLEAN ALLJOINT SURFACES to prevent brass Valves are of leaded forging brass. Brazing cannot be successfully accomplished unless a white flux is Tack weld the valve in Remove three body bolts, loosen the fourth, swing out bodywith ball open. Close the ball and remove the seats, ball andbody seals. (Discard the body seals when removed from thevalve.) Note the position of the seats so that they can bereplaced in the same position as they were Swing body in and secure it with one additional boltdiagonally from Weld pipe ends.

4 When gas welding, DO NOT play the flameupon the valve Allow the valve to cool and then reassemble with ball , seatsand the new body seals that are included with the IMPORTANT:The fluoropolymer-coated stainless steel gaskets that areincluded with the Worcester 1/4" 2" Cryogenic Valves makeexcellent seals, however, some points of caution in their userequire emphasis:a. The gaskets are NOT reusable. Upon removal from valve,they should be discarded and replaced with new Avoid scratching the fluoropolymer coating of the gasketsduring installation. Light lubrication of these seals canhelp to prevent Control DivisionWorcester Controlsc.

5 S type gaskets are installed with their widest flange tothe valve body (See view A on page 6).d. Swing center section back in Tighten and torque body bolts evenly, alternating in acriss-cross diagonal pattern. Use torque figures below:Bolt Diameterin-lbft-lb1/4"72-946-85/16"120-1 4410-123/8"192-21616-187/16"336-38428-32 1/2"504-55242-46D. When installing the 3" 6" Worcester Cryogenic Valves , usestandard gaskets which are suitable for the specific the flange bolts or studs evenly and in proper Please note: on the 3" 6" flangeless short pattern Valves (151 or 301), the ball protrudes slightly from each port. Afterdetermining the proper valve position ( , relief hole in ballfrom section ), open the ball before installation to avoiddamaging OPERATIONA.

6 To operate the Worcester Cryogenic ball Valve, turn the stem 1/4-turn clockwise to close and 1/4-turn counter-clockwise to manually operated 1/4" 2" Valves , the handle acts as a it points across the pipeline, the valve is manually operated 3" 6" Valves , the stop plate acts as apointer. When it points across the pipeline, the valve is To operate the Worcester Cryogenic Diverter Valve, rotate handle1/4-turn to divert the flow from the bottom port to either of the sideports. (The diverter valve also comes with a special 180 ball andstop plate. In this case the handle would be rotated 1/2-turn andthe handle would point to the port to which flow was diverted.)

7 C. These Valves will provide positive shut-off when used inaccordance with Worcester s Cryogenic Valvepressure/temperature DO NOT leave the ball partly open. DO NOT throttle withWorcester s Cryogenic Valves . It will result in seat DO NOT allow media which can solidify, crystallize or polymerizeto stand in the valve Torque Requirements:The valve torque will vary depending on the length of the timebetween cycles, line pressure, type of valve seats, and the mediain the figures in the following table are based on laboratory testswith LN2 as the media. These figures should approximate theactual valve torques. For a more detailed analysis of valve torquerequirements, see Worcester s Actuator Sizing ExpectedMaximum ExpectedValve Size Breakaway TorqueValve Size Breakaway Torque1/4" 1/2"80 in-lb2"625 in-lb3/4"150 in-lb 3"1100 in-lb1"200 in-lb 4"1500 in-lb11/2"475 in-lb 6"2200 in-lbIII.

8 MAINTENANCEThe Worcester Cryogenic Valve with the extended bonnet normallyoperates with the bonnet at a higher temperature than the of this, there will be a frost line about two-thirds of the wayup the extension. If the bonnet becomes covered with frost, it s anindication that the stem seals are the valve has an extended bonnet or not, if stem leakage isnoted, then adjust the stem nut per the following procedure:A. Stem Seal Readjustment Procedure:CAUTION: Excessive tightening causes higher torque andshorter stem seal Allow the valve to warm to ambient 1/4" 2" Valves with Two Stem Nuts and Lockwasher:a. On manual Valves , loosen the handle nut or handleassembly bolt (as applicable) to allow easy access to thestem seal retaining nut.

9 On actuated Valves , loosen While holding the stem to prevent turning, tighten thestem seal retaining nut until Belleville washers are flat(the nut will bottom); then back off 1 Retighten the handle nut or handle cap screw (asapplicable) while making certain that the stem sealretaining nut and stem are 1/4" 2" Valves with Self-Locking Stem Nut and Four BellevilleWashers:a. Tighten self-locking stem nut until Belleville washers areflat (the nut will bottom); then back off 1 Control DivisionWorcester ControlsCAUTION: The self-locking stem nut is difficult to tighten and mustfully flatten the Belleville washers before backing If seepage is noted at stem on 3" 6" Valves , tighten retainingnut 1/6-turn at a time until seepage REBUILDINGTHIS MANUAL CONTAINS EXPLODED VIEWS OF ALL VALVESCOVERED BY THE TEXT.

10 THEY HAVE BEEN INCLUDED TO AID IN THEREBUILDING OF THE VALVE. PLEASE REFER TO THEM WHENFOLLOWING THE WRITTEN : ball Valves CAN TRAP PRESSURIZED FLUIDS INBALL CAVITY WHEN CLOSED. If the valve has been used to controlhazardous media, it must be decontaminated before is recommended that the following steps are taken for saferemoval and disassembly: Relieve the line pressure. Operate the valve prior to attemptingremoval from line. Place valve in half-open position and flush the line to removeany hazardous material from valve. All persons involved in the removal and disassembly of thevalve should wear proper protective clothing such as faceshield, gloves, apron, A standard repair kit can be ordered for the Worcester CryogenicValve containing all necessary parts for normal valve order a repair kit you must specify the size, type of valve(extension or no extension), RK44 and revision ( C or R andnumber).