Emerson Fisher NPS 8 CHP Instruction Manual Download Page 5

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Instruction Manual

D104197X012

NPS 8 CHP Valve

September 2016

Figure 2. Packing Arrangements

UPPER WIPER (KEY 12)

PACKING FOLLOWER
(KEY 13)

FEMALE ADAPTOR
(KEY 32)

V‐RING (KEY 7)

MALE ADAPTOR
(KEY 31)

WASHER (KEY 10)

SPRING (KEY 8)

PACKING BOX RING
(KEY 11)

LOWER WIPER
(KEY 30)

KEY 6

PACKING FOLLOWER
(KEY 13)

GRAPHITE LAMINATE
PACKING RING (KEY 7)

GRAPHITE FILAMENT
PACKING RING (KEY 9)

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

PACKING FOLLOWER
(KEY 13)

PACKING RING
(KEY 7)

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

12A8160‐A

14A3412‐B

13A0112‐A

PTFE V‐RING

SINGLE PACKING

GRAPHITE LAMINATE AND FILAMENT

SINGLE PACKING

GRAPHITE/COMPOSITION

DOUBLE PACKING

UPPER WIPER (KEY 12)

PACKING FOLLOWER
(KEY 13)

FEMALE ADAPTOR
(KEY 32)

V‐RING (KEY 7)

MALE ADAPTOR
(KEY 31)

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

LOWER WIPER
(KEY 30)

KEY 6

PACKING FOLLOWER
(KEY 13)

GRAPHITE LAMINATE
PACKING RING (KEY 7)

GRAPHITE FILAMENT
PACKING RING (KEY 9)

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

PACKING FOLLOWER
(KEY 13)

PACKING RING
(KEY 7)

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

12A7839‐A
Sht 1

14A3414‐B

12A8163‐A

PTFE V‐RING

DOUBLE PACKING

GRAPHITE LAMINATE AND FILAMENT

DOUBLE PACKING

PTFE/COMPOSITION

DOUBLE PACKING

PACKING ARRANGEMENTS FOR 31.8 mm (1‐1/4 INCH) VALVE STEMS

NOTES:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS.
USE ONLY ONE BELOW EACH GRAPHITE LAMINATE RING.

HAS THE APPEARANCE OF FLAT WASHERS PRESSED TOGETHER.
HAS THE APPEARANCE OF A WOVEN OR BRAIDED RING.

C0634‐1

Summary of Contents for Fisher NPS 8 CHP

Page 1: ...tenance and parts information for the Fisher CHP control valve Refer to separate manuals for instructions covering the actuator positioner and accessories Do not install operate or maintain CHP valves without being fully trained and qualified in valve actuator and accessory installation operation and maintenance To avoid personal injury or property damage it is important to carefully read understa...

Page 2: ... kg Please consult Singapore SD S for any queries 1 The pressure temperature limits in this manual and any applicable standard or code limitation for valve should not be exceeded 2 For Boiler feedwater application proper use of a block valve during closing of the control valve is recommended to minimize control valve trim damage Description The CHP globe valve figure 1 has a metal seat cage guidin...

Page 3: ... the valve inspect it to ensure that the valve body cavity is free of foreign material 2 Clean out all pipelines to remove scale welding slag and other foreign materials before installing the valve 3 Flow through the valve must be in the direction indicated by the flow arrow which is attached to the valve body 4 Use accepted piping practices when installing the valve in the pipeline 5 Install a th...

Page 4: ...alve body mating surfaces remain parallel when hoisted Maintenance Refer to figure 4 Valve parts are subject to normal wear and must be inspected and replaced as necessary Inspection and maintenance frequency depends on the severity of service conditions This section includes instructions for packing maintenance and trim maintenance All maintenance operations may be performed with the valve in the...

Page 5: ...POSITION DOUBLE PACKING UPPER WIPER KEY 12 UPPER WIPER KEY 12 PACKING FOLLOWER KEY 13 FEMALE ADAPTOR KEY 32 V RING KEY 7 MALE ADAPTOR KEY 31 LANTERN RING KEY 8 PACKING BOX RING KEY 11 LOWER WIPER KEY 30 KEY 6 1 2 PACKING FOLLOWER KEY 13 GRAPHITE LAMINATE PACKING RING KEY 7 GRAPHITE FILAMENT PACKING RING KEY 9 LANTERN RING KEY 8 PACKING BOX RING KEY 11 3 PACKING FOLLOWER KEY 13 PACKING RING KEY 7 L...

Page 6: ...l for nicks or scratches while performing the following procedures Use care to avoid damaging these surfaces For spring loaded single PTFE V ring packing the spring maintains a sealing force on the packing If leakage is noted around the packing follower check to be sure the shoulder on the packing follower is touching the bonnet If the shoulder is not touching the bonnet tighten the packing flange...

Page 7: ...valve plug stem 5 Reassemble the packing follower upper wiper packing flange and packing flange nuts 6 Reconnect the body actuator stem connection according to the appropriate actuator instruction manual 7 Tighten the packing flange nuts only far enough to stop leakage under operating conditions Check for leakage around the packing follower when the valve is being put into service Retighten the pa...

Page 8: ...em assembly starts to lift with the bonnet use a brass or lead hammer on the end of the stem and tap it back down Set the bonnet on a cardboard or wooden surface to prevent damage to the bonnet gasket surface 7 Remove the valve plug key 3 bonnet gasket key 15 and three cage gaskets key 16 seat ring key 2 and the seat ring gasket key 17 CAUTION Inspect the seat ring cage bonnet and body gasket surf...

Page 9: ...mes to center the trim Torque the nuts in a crisscross pattern to no more than 1 4 of the nominal torque value specified in table 3 When all nuts are tightened to that torque value increase the torque by 1 4 of the specified nominal torque and repeat the crisscross pattern Repeat this procedure until all nuts are tightened to the specified nominal value Apply the final torque value again and if an...

Page 10: ...be reused tape or otherwise protect the valve plug stem and the valve plug seating surface to prevent scratches 3 Lift out the cage key 2 and the bonnet gasket key 15 and three cage gaskets key 16 4 Remove the seat ring key 6 and the seat ring gasket key 17 5 Inspect the parts for wear or damage and replace if needed 6 Refer to the Valve Plug Maintenance procedure or to the Lapping Seats procedure...

Page 11: ...the original positions Use the following procedure to lap the seating surfaces 1 Install the following parts according to the instructions presented in the trim replacement procedure old seat ring gasket key 17 seat ring key 6 cage key 2 and old bonnet gasket key 15 and three cage gaskets key 16 2 Install the valve plug and stem assembly keys 3 and 4 into the cage 3 Install the bonnet key 14 over ...

Page 12: ...ed hex nuts are used Install the hex nuts but do not tighten them Torque the nuts in a crisscross pattern to no more than 1 4 of the nominal torque value specified in table 3 When all nuts are tightened to that torque value increase the torque by 1 4 of the specified nominal torque and repeat the crisscross pattern Repeat this procedure until all nuts are tightened to the specified nominal value A...

Page 13: ...escription 1 Valve Body 2 Cage 3 Valve Plug 4 Valve Stem 5 Pin 6 Seat Ring 7 Seal Ring 8 Back Up Ring 9 Retaining Ring 10 Anti Extrusion Ring 11 Stud Cont Thd 12 Hex Nut 13 Carbon Steel Washer 14 Bonnet 15 Bonnet Gasket 16 Cage Gasket 17 Seat Ring Gasket 18 Piston Ring 19 Bore Seal 20 Flow Arrow 21 Drive Screw 22 Anti Seize Lubricant 23 Nameplate not shown 24 Wire not shown Bonnet Assembly figure ...

Page 14: ...Instruction Manual D104197X012 NPS 8 CHP Valve September 2016 14 ...

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