Instruction Manual

Instruction Manual
D100390X012
ED Valve
October 2014
18
Figure 10. Lower (Valve Plug to Seat Ring) and Upper (C-seal Plug Seal to Cage) Seating Surfaces
C-seal METAL
PLUG SEAL
RETAINER
CAGE
VALVE PLUG
NOTE:
UPPER SEATING SURFACE IS THE AREA OF CONTACT BETWEEN THE C-seal METAL PLUG SEAL AND THE CAGE.
PLUG
CAGE
SEAT
RING
UPPER SEATING SURFACE
LOWER SEATING SURFACE
A6780
1
1
Figure 11. Example of Machining the Lower (Valve Plug to Seat Ring) and U pper (C-seal Plug Seal to Cage) Seating
Surfaces
UPPER SEATING SURFACE
0.508 (0.020)
(4)
0.254 (0.010)
(4)
0.254 (0.010)
(4)
C-seal
RETAINER
MACHINING OF THE UPPER
SEATING SURFACE MUST
EQUAL THE TOTAL MACHINING OF
THE LOWER SEATING SURFACE
(PLUGPLUSSEAT RING). IF NOT,THE
RETAINER MAY STRIKE THE UPPER
SEATING SURFACE BEFORE THE
VALVE PLUG PROPERLY SEATS ON
THE LOWER SEATING SURFACE.
LOWER SEATING SURFACE
REMOVAL OF 0.254 mm (0.010 inch) FROM THE VALVE PLUG
PLUS
REMOVAL OF 0.254 mm (0.010 inch) FROM THE SEAT RING
REMOVAL OF 0.508 mm (0.020 inch) FROM THE
UPPER SEATING SURFACE IN THE CAGE
4. THESE VALUES ARE FOR EXAMPLE ONLY. REMOVE ONLY THE
MINIMUM AMOUNT OF MATERIAL REQUIRED TO REFURBISH THE SEATS.
SEAT
RING
PLUG
CAGE
A6781 / IL
1
3
2
1
2
3
NOTE:
MUST EQUAL
mm (inch)
2. Remove the plug/retainer assembly (with C-seal plug seal), cage, and seat ring from the valve body following the
appropriate instructions in the Trim Removal section of this manual.
3. Locatethestakedthreadontopofthevalveplug(figure9).Thestakedthreadsecurestheretainer.Useadrillwitha
1/8 inch bit to drill out the staked area of the thread. Drill approximately 3 mm (1/8 inch) into the metal to remove
the staking.
4. Locate the break between sections of the piston ring(s). Using an appropriate tool such as a flat-blade screwdriver,
carefully pry out the piston ring(s) fromthegroove(s)intheC-sealretainer.