Flowserve WK70 User Manual

Worcester Controls

CAUTION: Flowserve recommends that this product be stored indoors prior to installation, in an environment suitable for human occupancy. Avoid areas where exposure to relative humidity above 85%, acid or alkali fumes, radiation above normal background, ultraviolet light, or temperatures above 1200°F/below 400°F may occur. Do not store within 50 feet of any source of ozone.

A. INSTALLATION

1. WK70/WK74 valves may be installed for flow or vacuum in either direction. Use care to exclude pipe sealants from the valve cavity. Valves with upstream relief hole in ball (V3 option) are directional (one-way) valves.

2. Weld End Valves: Prior to welding or brazing, ENSURE ALL JOINT SURFACES ARE CLEAN, to prevent contamination. Valves with XBO pipe ends can be welded in the line without disassembly of the valve.

3. CAUTION:

a. With the exception of valve seats, no fluoropolymer parts are

reusable.

b. Special care should be taken to avoid scratching the

fluoropolymer seals during installation. Light lubrication of these seals can help to prevent damage.

c. WK70/WK74 valves and repair kits have been assembled,

cleaned, and packaged for ultra-high purity systems. Caution should be used to maintain the cleanliness of the valve parts.

d. WK70/WK74 valves are factory assembled with NO

lubrication.

B. OPERATION

1. Valve operation consists of turning the handle a quarter-turn clockwise to close and a quarter-turn counter-clockwise to open. The valve is open when the handle and/or stem flats are in line with the pipeline. WK70/WK74 valves may be automated (used with actuators).

2. These valves will provide bubble-tight shut-off when used in accordance with Worcester’s published pressure/temperature chart.

3. It is not good practice to leave a ball valve partly open (throttling operation) without knowledge of the pressure drop and flow at that position.

4. Media that can solidify, crystallize or polymerize should not be allowed to stand inside ball valve cavities.

5. Torque Requirements - Operating torque requirements will vary depending on the length of time between cycles, line pressure, type of valve seats, or the media in the piping system. For a detailed analysis of valve torque requirements, refer to the Worcester Actuator Sizing Manual.

C. MAINTENANCE

Tighten the retaining nut if leakage is visible in the stem area.

CAUTION: Over-tightening stem nuts results in high operating torque and shorter stem seal life. Follow proper stem adjustment procedure below.

For Manual Valves (with two stem nuts):

1. Tighten retaining nut (lower nut) clockwise until Belleville washers are “bottomed-out” flat.

2. Back off the retaining nut

6 of a turn.

3. Tighten handle nut securely to lock retaining nut in place.

For Automated Valves (with one self-locking stem nut):

1. Tighten self-locking stem nut until Belleville washers are “bottomout” flat.

2. Back off nut

3 of a turn. NOTE: The self-locking nut requires a

good amount of effort to tighten. Ensure that Belleville washers are fully compressed flat before backing off.

12630-B

Tube Bore Clean Valves

2" – 2" WK70 and

2" – 2" WK74

Installation, Operation and Maintenance Instructions

Flow Control Division

Worcester Controls

D. REBUILDING

a WARNING: BALL VALVES CAN TRAP PRESSURIZED FLUIDS INSIDE THE BALL CAVITY WHEN CLOSED.

If the valve has been subjected to hazardous media, it must be decontaminated before disassembly. Follow the steps below for safe removal and disassembly procedure.

• All personnel involved in the removal and disassembly of the valve should be equipped with proper protective gear such as face shield, gloves, apron, etc.

• Relieve the line pressure and cycle the valve back and forth a few times prior to removal.

• Position valve half-open and flush the line to remove any residual hazardous media.

1. A standard repair kit is available for these valves. Use repair kit designation WKRK70 for both WK70 and WK74 valves. The kit consists of seats, body seals, four Belleville washers, stem seals and thrust bearings. Specify the material of the seats and body seals, size, Series and R number (revision no.) of valve or for non-standard valve, the “P”, “T”, “C”, or similar number, as found on the handle, the valve nameplate or the actuator bracket nameplate.

To Order: Valve Size/Series/RK 70/Material/Revison Number, or

P, T,C, or similar number Example: 1" WK RK 70 RT T1510

CAUTION: If the replacement seat and seal material differs from those being removed, the valve nameplate or stop MUST be replaced or altered to indicate the new material /new rating or valve tagged to so indicate.

2. To replace seats and seals:

a. Place valve in open position. Remove three body nuts and

bolts and LOOSEN the fourth, swing out the valve center section from between the pipe ends.

b. Now, with valve in closed position, remove old seats, body

seals and ball.

c. Remove handle nut, lockwasher, and handle (if manual

valve). This step is not applicable to valves with single selflocking stem nut.

d. Using handle or a wrench to prevent stem from turning,

remove retaining or self-locking stem nut, Belleville washers, and follower from the stem. Remove stem through body cavity.

e. Remove thrust bearings from body or stem, stem seals and

seal protector from the recess in the top of the body.

f. Clean/remove all foreign matter from the sealing surfaces of

the valve and the ball.

NOTE: The ball and the surfaces against which the seats and seals are installed should be undamaged, clean, and free of pit marks and scratches. Light marring from the action of the ball against the seats is normal and will not affect the operation of the valve. Flaws that can be seen but barely detected with fingertips are acceptable. The stem and body surfaces that the thrust bearing and stem seals contact must be undamaged, clean, and free from pit marks and scratches.

g. For stem area rebuilding, refer to exploded view and stem

build illustrations on the next page.

Order of Assembly:

Place new thrust bearings on stem and insert assembly through body cavity. Place new stem seals, stem seal protector, and the follower in position. PEEK thrust bearing and stem seal protectors are placed outside of seals and bearings. The seals/bearings must contact the body.

Stem seals, stem seal protectors and thrust bearings that are the same size and color are generally interchangeable.

h. Place two new Belleville washers in position with their larger

diameter faces touching each other.

For those valves with single self-locking stem nut, place four new Belleville washers in position (two pairs of washers with larger diameter faces touching).

i. Thread retaining or self-locking stem nut onto stem and using

handle or a wrench to prevent rotation, tighten the nut snugly. Follow Section C-Maintenance for proper stem adjustment.

j. Replace one-piece handle and stop (if manual valve),

lockwasher and handle nut onto stem. (This step is not applicable to valves with self-locking stem nut).

k. With valve in closed position (stem flats oriented across the

pipeline) replace ball (see note on page 4) and new seats. With valve in open position, carefully insert new body seals and place center section between the pipe ends.

2 Tube Bore Clean Valves:

2" – 2" WK70 and

2" – 2" WK74 Installation, Operation and Maintenance 12630-B

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