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ManualsBrandsSiemens Manuals656 Series Globe Valves656 Powermite Repack Kit (Pack of 6)

Powers™ Controls

Technical Bulletin

Document No. 155-240P25

TB 233

March 7, 2005

656 Powermite Valve with

3-inch Top Rebuilding

Siemens Industry, Inc.

Description

This Technical Bulletin describes the recommended method of rebuilding the 656

Powermite valve.

Warning/Caution Notations

WARNING

Personal injury/loss of life may occur if you do

not perform a procedure as specified.

CAUTION

Equipment damage, or loss of data may occur if

you do not perform a procedure as specified

Product Numbers

Table 1.

VP 656 Valve

Rebuild/Repack Kit

Repacking Kit

1/2 NO Cv 0.5

Spring Range 3-8 psi

656-769

656-601

1/2 NO Cv 0.9 & 2.1

Spring Range 3-8 psi

656-761

1/2 NO Cv 0.5 & 2.1

Spring Range 5-10 psi

656-768

3/4 NO Cv 4.6 656-762

1/2 NC Model 1 & 2 656-763

1/2 NC Model 3 656-014

3/W Flared Cv 1.5 656-764

3/W Flared Cv 2.5 656-765

3/W Screwed 656-766

656-0006 Discontinued 656-767

WARNING:

Shut off medium and remove the valve from the line before beginning the

rebuilding.

Diaphragm and

Quad Ring

Replacement

(See Figure 1)

1. Remove four housing screws and remove the upper housing.

2. Remove the diaphragm and the piston cup.

3. Press down on the piston plate to remove the E-ring.

Summary of content (7 pages)

PAGE 1
Technical Bulletin Document No. 155-240P25 TB 233 March 7, 2005 Powers™ Controls 656 Powermite Valve with 3-inch Top Rebuilding Description This Technical Bulletin describes the recommended method of rebuilding the 656 Powermite valve. Warning/Caution Notations WARNING Personal injury/loss of life may occur if you do not perform a procedure as specified. CAUTION Equipment damage, or loss of data may occur if you do not perform a procedure as specified Table 1.
PAGE 2
Technical Bulletin Document Number 155-240P25 March 7, 2005 Diaphragm and Quad Ring Replacement, Continued 656 Powermite Valve with 3-inch Top Rebuilding CAUTION: Hold the piston plate securely. Removing the E-ring releases the tension on the piston plate and spring. 4. Use a screwdriver to release the E-ring from the groove in the stem. 5. Remove the washer and piston plate from the valve stem and lift out the valve spring and the spring washer (10 to 15 psi spring only). 6.
PAGE 3
656 Powermite Valve with 3-inch Top Rebuilding Diaphragm and Quad Ring Replacement, Continued Technical Bulletin Document Number 155-240P25 March 7, 2005 9. Before installing the new quad ring, clean the stem and the quad ring recess to remove any foreign matter. Apply a light coating of silicone grease to the valve stem, bonnet chamber, and quad ring. 10. Place the new quad ring in place and reinstall quad ring retainer over new seal with the shorter portion of the retainer next to the quad ring. 11.
PAGE 4
Technical Bulletin Document Number 155-240P25 March 7, 2005 656 Powermite Valve with 3-inch Top Rebuilding Disc Replacement 1. Loosen and unscrew the bonnet from the valve body. Normally Open Valves (See Figure 3 ) 2. Holding the disc holder securely with pliers, use a hex Allen wrench to unscrew the throttling nut from the stem assembly. 3. Remove the disc from the stem assembly and replace with new disc. 4. Return the throttling nut to the stem assembly. 5. Remove and replace the O-ring, if present.
PAGE 5
656 Powermite Valve with 3-inch Top Rebuilding Disc Replacement, Continued Technical Bulletin Document Number 155-240P25 March 7, 2005 1. Loosen and unscrew the cap from the bottom of the valve body. If the stem assembly is not easily accessible, put 20 psi (138 kPa) air pressure on the valve actuator. Normally Closed Valves 2.
PAGE 6
Technical Bulletin Document Number 155-240P25 March 7, 2005 Throttling Plug Replacement for Water Mix Flared End Valves, Continued 656 Powermite Valve with 3-inch Top Rebuilding 3. To disassemble the stem assembly, put 20 psi (138 kPa) air pressure on the valve actuator. Hold the stem with a 3/32-inch hex Allen wrench and use a 1/4-inch wrench to unscrew the throttling plug locknut from the stem assembly.
PAGE 7
656 Powermite Valve with 3-inch Top Rebuilding Technical Bulletin Document Number 155-240P25 March 7, 2005 Water Mix Screwed 1. Loosen and unscrew the valve seat (bottom port) from the valve body. If the stem assembly is not easily accessible, put 20 psi (138 kPa) air pressure on the valve End Valves actuator. 2. Use a 3/32-inch hex Allen wrench in the bottom of the valve stem to prevent it from turning while using a 3/8-inch wrench to loosen and unscrew the disc retaining nut from the stem assembly. 3.