Attch_1_J6 Steam Mtr Valves.pdf

Not Sensitive

Specification J6 36” Steam Gate Valve Actuator

Project 15046 Arnold AFB, TN 37389

March 2020

Electric Actuator The electric actuator shall include the motor, actuator gearing, limit switch gearing, limit switches, torque switches, drive sleeve with removable stem nut, declutch lever, and auxiliary hand wheel as a self-contained unit. The electric actuator shall conform to applicable sections of the Machinery Directive 2006/42/EC, EMC Directive 2004/108/EC, and Airborne Noise Directive

2003/10/EC.

The actuator shall be a factory new Flowserve Limitorque L120-420 series product with a V7 gearbox suitable for use on a 36” high pressure steam gate valve. Reconditioned actuators will not be accepted.

Enclosure The actuator motor and all electrical enclosures shall be:

Weatherproof, NEMA 4 All gear housing seals shall be Viton. Enclosure gaskets shall be synthetic fiber and conform to ASTM F104. The gear housing shall be gray cast iron or ductile iron.

Motor Power supply to the motor shall be:

3-phase, 60 Hertz o 460 volts

At a minimum, the motor shall be designed for 15-minute duty for three phase AC motors and 5-minute duty for single phase AC and DC motors.

Motors shall be designed with a full load torque rating that is 20% of the nominal torque rating, minimum.

The motor shall be specifically designed for valve or gate actuator service and shall be totally enclosed, non-ventilated, squirrel-cage induction design with motor leads brought into the limit switch compartment for termination on a 300v-rated terminal strip. Motor insulation shall be NEMA class H. Bi-metallic motor thermal overloads shall be rated Class B unless specified otherwise or as required by the application.

The motor shall be of sufficient rating to open or close the valve or gate against the maximum expected differential pressure when the voltage to the motor terminals is 10% above or below nominal voltage. The motor duty rating shall be sufficient for one complete open to close to open (or reverse) cycle without exceeding its temperature rating. The motor shall be pre-lubricated and all bearings shall be of the anti-friction type.

Actuator Gearing The actuator drive train shall utilize double reduction gearing consisting of the motor gear set and the worm/worm gear set. The design shall allow for quickly changing the output speed with a simple motor gear set change. The motor set shall consist of heat-treated steel helical gears.

Spur gears are not acceptable as motor reduction gearing. The worm/worm gear set shall consist of a hardened alloy steel worm and a bronze worm gear conforming to ASTM B584.

Stamped or rolled gearing is unacceptable.

All power gearing shall be grease lubricated and operate on the immersion principle. All shafts throughout the drive train shall be bearing-supported. Epicyclic gearing designs are not acceptable.

Drive Sleeve Design The actuator shall have a built-in lost motion device at the drive sleeve/worm gear interface which allows for travel sufficient for the motor to reach full speed before imparting a hammer blow to start the valve or gate in motion in either the closing or opening direction. The impact load shall be shared equally by two lugs cast integrally on the drive sleeve.

A no-lost-motion design for the drive sleeve/worm gear interface shall be provided for valves or gates in inching, throttling, regulating, or modulating service.

Stem Nut The actuator shall be provided with a stem nut of:

High tensile bronze conforming to ASTM B584 for rising stem valve or gate applications.

The stem nut for rising stem valves be a top entry and removal design to allow for removal of the stem nut without removing the actuator from the valve, disconnecting the electrical wiring, or disassembling any of the gearing within the actuator. The stem nut must be of the top entry design and engage the drive sleeve with a multiple splined connection. Keyed stem nut connections are not acceptable due to the potential for failures due to keys shearing or potential for becoming disengaged and falling out of the drive due to load, vibration or installation errors.

Manual Operation A hand wheel shall be provided for manual operation. The hand wheel shall not rotate during motor operation nor shall a fused motor prevent manual operation. When declutched into operation by the hand wheel the actuator shall remain in manual mode until the motor is energized, at which time the actuator will automatically return to electric operation. The actuator shall remain in motor operation until hand wheel operation is desired. This movement from motor operation to hand wheel operation shall be accomplished by a positive declutching lever which will disengage the motor and motor gearing mechanically but not electrically. Hand operation shall require no more than 100 pounds of rim effort at the maximum required torque. It shall not be possible for the actuator to be simultaneously in manual and motor operation.

Control Compartment The limit switch, torque switch, control wiring, other electrical controls, and terminal strips shall be housed in:

A weatherproof, NEMA 4 enclosure.

Limit Switches and Limit Switch Gearing Limit switch gearing shall be of the intermittent type, totally enclosed in its own gear case to prevent dirt and foreign matter from entering the gear train. The limit switch contact assembly shall be geared to the actuator drive sleeve, in step with the valve or gate movement whether in manual or motor operation. Loss of actuator operation due to worm/worm gear failure shall not prevent the limit switches from remaining in-step with valve or gate position.

The limit switch gear housing shall be grease lubricated, with gearing made of bronze or stainless steel. Limit switches shall be adjustable, capable of being set to trip at any point of valve or gate travel between fully open and fully closed, and shall not be subject to breakage or slippage due to over-travel.

Limit switches shall be of the heavy duty, open contact type with rotary wiping action. The limit switch shall be constructed with a 4-rotor design with 4 contacts per rotor. The contacts shall be heavy duty – silver inlaid, and rated for 300 volts, 6 amps resistive and 60 amps inrush current at 120 volts AC, in accordance with NEMA ICS standards. Micro-switches, electronic position sensing, or similar configurations are not acceptable.

Torque Switches The torque switch shall be responsive to valve or gate torque in the opening or closing directions of operation. The switch shall have numbered dials which shall be independently adjustable to allow for separate torque output limits in each direction of operation.

The torque switch shall operate during the complete valve or gate cycle without the use of auxiliary relays, linkages, latches, or other devices. The torque switch shall be wired to shut off the actuator motor in the event excessive torque is generated in either direction of travel. The closing torque switch shall be wired to shut off the actuator motor when a predetermined torque is reached which corresponds to the required seating thrust for wedge gate or globe valves.

Torque switches shall be of the heavy duty, open contact type, with contacts that are silver inlaid, and rated for 300 volts, 6 amps resistive and 60 amps inrush current at 120 volts AC, in accordance with NEMA ICS standards. Micro-switches, electronic torque sensing, or similar configurations are not acceptable.

Certifications and Testing Each actuator shall be supplied with a Flowserve Limitorque test report documenting the following data for each actuator serial number:

Actuator stall torque Actuator torque and Maximum torque switch setting.

Actuator Torque Switch Setting per required valve torque.

Motor FLA Current Motor Stall Current Motor Voltage Actuator output Speed

Position Indication Actuators requiring position indication shall be equipped with a mechanical dial position indicator providing valve or gate position in degrees of travel. The indicator shall be mechanically coupled to the geared limit switch to remain in step with valve or gate position in manual or motorized operation. Use of nonmetallic gearing in the MDPI gearing, shall not be allowed.

Remote indication of valve or gate position shall be provided by:

A 1,000-ohm potentiometer that is driven by the position indicator gearing and is proportional to valve or gate position.

Integral Controls The actuator shall be equipped with:

A geared limit switch, torque switch, reversing contactor, control power transformer, 300 volt-rated terminal strip, and compartment heater. The terminal strip shall have a sufficient number of terminals available for incoming power, control wiring for the limit switch and torque switch, and additional controls as required by the plant control system.

Reversing contactors shall be mechanically and electrically interlocked to prevent simultaneous energizing of the open and close coils. Control transformers shall be furnished with dual fuse primaries.

Motor reversal shall not require printed circuit boards to achieve open and close operation.

Specific Requirements Electric motor actuator and gear box to fit existing 36” high pressure steam gate valve. The electric motor actuator shall be 3 phase 460-480 VAC with integral controls. Limit switches shall be gear driven, cam operated, and snap acting. Limit switches shall be four rotor/16 SPST contact switches (four contacts per rotor, 2 N/O and 2 N/C). Rotors may be set to open or close at any valve position. Limit switches shall have Contact rating is 600 volts per ICS-125.6.

Current rated 6 amps resistive and 60 amps inrush at 120 VAC. Torque switch rated at 600 volts per ICS-125.6, 6 amps resistive and 60 amps inrush at 120 VAC. One SPST contact each for open/closed direction dedicated to actuator torque protection. Side mount hand-wheel with declutch feature. Double reduction gear box with stem nut. Stem nut shall include a 3” extension. Worm gear (alloy bronze) and spur gear (heat-treated steel), and worm (alloy steel) and helical gearing (heat-treated teel). Adapter plate shall be supplied if necessary to adapt gear box to existing bonnet. Valve stem cover shall be provided to adapt to gear box. Top of

Valve stem cover shall be located 55” above the bonnet. Actuator and gear box shall provide a valve stroke time shall be in the 90 to 110 second range and produce a torque of 11,500 ft-pounds or more. Limitorque L120-420/150-2P.

Steam Dimensions

4-1/8” Diameter

Double Lead, Left Hand Threads

2 threads per inch

Bonnet Mating Dimensions

16” OD (gear box may over hand if necessary)

Eight 1-1/4”-7 threaded bolt holes on 14” Bolt Circle o Bolts shall thread into gear box

6-1/2” through hole for shaft