3
Valve Disassembly
Before beginning any maintenance, make sure to read
the Safety Precauons secon of this I&M.
Note: An exploded view of valve parts is available at the
end of this I&M.
1. To inspect and/or replace body seals, seats, packing,
and/or ball, the valve must be in the open posion with
no flow through the valve and removed from pipeline.
2. With the valve in the open posion, undo Body Bolts
(6) to separate valve Body (1) and End Caps (2).
3. Remove the Seats (5), Housing Seal (19), Back-up Seal
(20), Disk Spring (5A), and Gasket (3).
4. Turn valve in the closed posion so the Ball (4) can be
taken out from the Body (1).
5. Remove Handle Nut (15), Handle (18), Spacer (14),
and Nut Stop (13).
6. Remove the Stem Nut (12) to remove Disk Washers
(11), Gland Washer (10), and Stem Packing (9).
8. Push the Stem (8) down into the body cavity to
remove. Once removed take off the Thrust Washer (7)
and Half Split Rings (8A).
When the valve is disassembled, be sure to clean and
examine all valve parts.
1. Ball surface should be free from defects, and if any
are found, ball should be replaced. Using a defecve
ball will severely impair the valve performance.
2. The replacement of valve seats is recommended.
3. Stem seals and body seals (including the thrust
washer) should be discarded and replaced.
4. Aer cleaning the rest of the valve parts, examine
them for wear, corrosion, or mechanical damage.
Replace any defecve parts.
Recommended spare manufacturers parts are
indicated by an asterisk on Table B by the part name,
numbered by the exploded view at the end of this I&M.
Be sure to specify the exact valve part number to
ensure the correct parts are ordered.
J Flow Controls does not take responsibility for
incorrectly ordered spare parts.
Valve Reassembly
1. Apply an adequate amount of lubricant, that is
compable with the media being handled, around the
Ball (4), Seats (5), Housing Seal (19), Back-up Seal (20),
Disk Spring (5A), Gasket (3), Stem (8), and Thrust
Washer (7).
2. For stem reassembly, disassembly procedure should
be followed in reverse order.
3. When stem assembly is complete, ghten Stem Nut
(12) according to the values on Table A.
4. With the Stem (8) in the closed posion, insert the
Ball (4) into the Body (1) so that stem slot engages with
the slot at the base of the stem.
5. Insert Seats (5), Housing Seal (19), Back-up Seal (20),
Disk Spring (5A), and Gasket (3) into the Body (1).
6. Place End Caps (2) on either side of the Body (1).
7. Insert and finger ghten Body Bolts (6) diagonally, in
accordance to the cross pa ern procedure to Body (1).
8. In the final assembly step ensure that body bolts are
ghtened accordinglyto the torques values in Table A.
9. Replace Nut Stop (13), Spacer (14), Handle (18), and
Handle Nut (15) then ghten .
www.jflowcontrols.com
sales@jflowcontrols.com
J Flow Controls
4665 Interstate Dr.
Cincinna, OH 45246
Toll Free: 866-95-JFLOW (53569)
Local: 513-330-6354
Fax: 513-731-6939
DM 4800 Series MS Ball Valve
Installaon – Maintenance Manual
Document #: IM-DM4800 MS-01
Rev Date: 2010-02-01
Installaon & Maintenance for J Flow DM4800 Series Metal Seated Ball Valve
