Emerson Fisher EZ-C Manual de usuario

www.Fisher.com

Fisher™EZ‐C, ET‐C, and EWT‐C Cryogenic

Sliding‐Stem Control Valves

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Specifications 2...............................

Educational Services 3.........................

Installation 3..................................

Maintenance 5.................................

Packing Maintenance 7.........................

Replacing Packing 7........................

Trim Maintenance 10..........................

EZ‐C Trim Disassembly 10...................

EZ‐C Trim Assembly 11.....................

ET‐C and EWT‐C Trim Disassembly 12.........

ET‐C and EWT‐C Valve Plug Maintenance 13....

ET‐C and EWT‐C Trim Assembly 14...........

Coining Soft Metal‐to‐Metal Seats 14.........

Parts Ordering 14...............................

Parts Kits 15...................................

Parts List 18...................................

Bonnet Parts 18...............................

EZ‐C Valve Body Parts 18.......................

ET‐C and EWT‐C Valve Body Parts 22..............

Figure 1. Typical Fisher Cryogenic Valve with

Extension Bonnet and 585C Series Actuator

W6370

Introduction

Scope of Manual

This instruction manual includes installation, maintenance, and parts information for Fisher EZ‐C, ET‐C and EWT‐C

valves (see figure 1). Refer to separate manuals for instructions covering the actuator and accessories.

Do not install, operate, or maintain EZ‐C, ET‐C or EWT‐C 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, understand, and follow all the contents of this manual, including all safety cautions and

warnings. If you have any questions about these instructions, contact your Emerson sales office or Local Business

Partner before proceeding.

Description

EZ‐C: globe‐style, single‐port, unbalanced valves with integral end connections, post guiding, metal‐to‐metal seating,

and quick‐change trim. They feature stainless steel construction materials and fabricated extension bonnets.

ET‐C and EWT‐C: metal‐to‐metal seated globe‐style, single‐port, cage‐guided, pressure‐balanced valves featuring

stainless steel construction materials and fabricated extension bonnets.

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

Table 1. Specifications

Valve Sizes

EZ‐C: NPS J1, J1-1/2, J2, J3, and J4

ET‐C: NPS J3, J4, J6, and J8

EWT‐C: NPS J6X4(1), J8X4, J8X6, J12X6, and

J10X8

End Connection Styles(2)

CL150, 300, and 600 raised‐face flanges per ASME

B16.5

Maximum Inlet Pressure(2)

CL150 and 300—Valves are consistent with

pressure‐temperature ratings per ASME B16.34

CL600—Valves with B8M Class 2 bolting are

consistent with CL600 pressure‐temperature ratings

per ASME B16.34 except as shown below:

EZ‐C VALVES

Valve Size, NPS Maximum Inlet Pressure

Bar Psig

1110

1200

1370

ET‐C AND EWT‐C VALVES

Valve Size, NPS Maximum Inlet Pressure

Bar Psig

3 94 1370

6, 8 x 6, 12 x 6 75 1085

8, 10 x 8 96 1390

CL600—Valves with optional S20910 (XM‐19) bolting

are consistent with CL600 pressure‐temperature

ratings per ASME B16.34

Shutoff Classifications per ANSI/FCI 70‐2

and IEC 60534‐4

VALVE SHUTOFF CLASS

EZ‐C Class IV—Standard

Class VI—Optional

ET‐C and EWT‐C

Class IV—Standard

Class V Air Test(3)

—Optional

Material Temperature Capability(2)

EZ‐C: -198 to 149_C (-325 to 300_F)

ET‐C and EWT‐C:

-198 to 66_C (-325 to 150_F)

Maximum Allowable Actuator Thrust

See table 2

Flow Characteristics

EZ‐C: Equal percentage, linear, and

quick opening

ET‐C and EWT‐C: Equal percentage and linear

Flow Directions

EZ‐C:Up through the seat ring only

ET‐C and EWT‐C:Normally down(4)

Approximate Weights

EZ‐C:

NPS 1: 11 kg (33 lb)

NPS 1-1/2: 23 kg (48 lb)

NPS 2: 41 kg (90 lb)

NPS 3: 60 kg (130 lb)

NPS 4: 95 kg (210 lb)

ET‐C:

NPS 3: 51 kg (135 lb)

NPS 4: 95 kg (210 lb)

NPS 6: 211 kg (465 lb)

NPS 8: 372 kg (820 lb)

EWT‐C

NPS 6X4: 200 kg (440 lb)

NPS 8X4: 277 kg (610 lb)

NPS 8X6: 318 kg (700 lb)

NPS 12X6: 730 kg (1610 lb)

NPS 10X8: 753 kg (1660 lb)

1.Valve size number is end connection size by normal trim size. For example, an NPS 6X4 valve has NPS 6 end connections with NPS 4 trim.

2.Do not exceed the pressure/temperature limits in this manual and any applicable code limitation.

3.Class V Air Test is optional. Test will be 50 psid air. Class V shutoff cannot be performed with water. The residual trapped moisture from testing with water can cause valve and trim damage

from ice crystals formed at below freezing service temperatures.

4.Down is in through the cage and out the seal ring. (see figure 9).

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

Table 2. Maximum Allowable Actuator Thrust for Standard Style 3 Bonnet Extension Length

VALVE SIZE, NPS STEM DIAMETER MAXIMUM ALLOWABLE STEM LOAD

FOR S20910 (XM‐19) STEM MATERIAL

mm Inches N Lb

19.5 3/8 5382 1210

12.7 1/2 13166 2960

1-1/2 9.5 3/8 5338 1200

12.7 1/2 13166 2960

212.7 1/2 14367 3230

19.1 3/4 44169 9930

312.7 1/2 15301 3440

19.1 3/4 45459 10220

4, 6X4, 8X4 12.7 1/2 16458 3700

19.1 3/4 46971 10560

6, 8X6, 12X6 19.1 3/4 36385 8180

25.4 1 81487 18320

8, 10X8 19.1 3/4 41366 9300

25.4 1 87003 19560

Educational Services

For information on available courses for Fisher EZ-C, ET-C, and EWT-C valves, as well as a variety of other products,

contact:

Emerson Automation Solutions

Educational Services - Registration

Phone: 1-641-754-3771 or 1-800-338-8158

E-mail: [email protected]

emerson.com/fishervalvetraining

Installation

Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the

process media from both sides of the valve. Remove actuator supply pressure, and use lockout procedures to be sure

that the above measures stay in effect while you work on the equipment. Refer to the Warnings at the beginning of the

Maintenance section for additional information.

WARNING

Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal

injury.

Personal injury or equipment damage caused by sudden release of pressure may result if the valve assembly is installed

where service conditions could exceed the limits given in table 1 or on the appropriate nameplates. To avoid such injury or

damage, provide a relief valve for over‐pressure protection as required by government or accepted industry codes and

good engineering practices.

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this

instruction manual.

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

CAUTION

When ordered, the valve configuration and construction materials were selected to meet particular pressure, temperature,

pressure drop, and controlled fluid conditions. Since some valve body/trim material combinations are limited in their

pressure drop and temperature ranges, do not apply any other conditions to the valve without first contacting your

Emerson sales office or Local Business Partner.

Before installing the valve, inspect the valve and pipelines for any damage and any foreign material which may cause

product damage.

1. Before installing the valve, inspect the valve and associated equipment for any damage and any foreign material.

2. Make certain the valve body interior is clean, that pipelines are free of foreign material, and that the valve is

oriented so that pipeline flow is in the same direction as the arrow on the side of the valve.

3. Gas Service: The normal method of mounting for gas service is with the actuator vertical above the valve body.

However, the control valve assembly may be installed in any orientation unless limited by seismic criteria. Other

positions may result in uneven valve plug and cage wear that could result in improper operation. For mounting

assistance, consult your Emerson sales office or Local Business Partner.

CAUTION

To avoid possible damage to the packing, do not allow the installed actuator angle to be so flat as to allow liquid inside the

bonnet to come in contact with the packing.

Also, if insulation is applied, do not let the insulation run up the extension bonnet. This could cause the packing to freeze

and be damaged.

Liquid Service: The preferred method of mounting for liquid service is with the actuator vertical above the valve body.

This will allow a vapor layer to form between the liquid and the packing. If there are piping constraints, the actuator

can be angled slightly from vertical. However, in no case should the angle be so flat as to allow liquid inside the bonnet

to come in contact with the packing. For mounting assistance, consult your Emerson sales office or Local Business

Partner.

4. If insulation is applied, make sure it is applied only to the body/bonnet joint. Do not let the insulation run up the

extension bonnet.

5. Use accepted piping and welding practices when installing the valve in the line. For flanged valve bodies, use a

suitable gasket between the valve body and pipeline flanges.

6. If the actuator and valve are shipped separately, refer to the actuator mounting procedure in the appropriate

actuator instruction manual.

WARNING

Personal injury could result from packing leakage. Valve packing was tightened before shipment; however, the packing

might require some readjustment to meet specific service conditions.

Valves with ENVIRO‐SEAL™live‐loaded packing will not require this initial readjustment. See the Fisher instruction

manual titled ENVIRO‐SEAL Packing System for Sliding‐Stem Valves for packing instructions. If you wish to convert

your present packing arrangement to ENVIRO‐SEAL packing, refer to the retrofit kits listed in the parts kit sub‐section

near the end of this manual.

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

Maintenance

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 line.

WARNING

Avoid personal injury or property damage from sudden release of process pressure. Before performing any maintenance

operations:

D Do not remove the actuator from the valve while the valve is still pressurized.

D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal

injury.

D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the

actuator cannot suddenly open or close the valve.

D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure

from both sides of the valve. Drain the process media from both sides of the valve.

D Vent the pneumatic actuator loading pressure and relieve any actuator spring precompression.

D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.

D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the

pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when

loosening the packing box pipe plug.

D Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

CAUTION

Follow instructions carefully to avoid damaging the product surfaces, which could result in damage to the product.

Note

Whenever a gasket seal is disturbed by removing or shifting parts, a new gasket should be installed upon reassembly. This is

necessary to ensure a good gasket seal since the used gasket may not seal properly.

Figure 2. Single PTFE V‐Ring Packing Arrangement

12A7837‐A

A6745

UPPER WIPER

(KEY 12)

PACKING

FOLLOWER

(KEY 13)

WASHER

(KEY 10)

SPRING

(KEY 8)

PACKING BOX

RING (KEY 11)

FEMALE

ADAPTER

PACKING RING

MALE

ADAPTER

LOWER WIPER

NOTE:

PACKING SET (KEY 6) CONTAINS A FEMALE ADAPTER, V-RING PACKING RINGS, MALE ADAPTER, AND LOWER WIPER RINGS.

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

Figure 3. Double PTFE V‐Ring Packing Arrangements

A6746

9.5 mm

(3/8 INCH)

STEM

12.7 mm

(1/2 INCH)

STEM

19.1, 25.4, OR 31.8 mm

(3/4, 1, OR 1‐1/4 INCH)

STEM

UPPER WIPER

(KEY 12)

PACKING

FOLLOWER (KEY 13)

LANTERN RING

(KEY 8)

PACKING BOX

RING (KEY 11)

FEMALE

ADAPTER

PACKING RING

MALE

ADAPTER

LOWER WIPER

NOTE:

PACKING SET (KEY 6) CONTAINS A FEMALE ADAPTER, V-RING PACKING RINGS, MALE ADAPTER, AND LOWER WIPER RINGS.

Figure 4. Graphite Ribbon/Filament Packing Arrangements

GRAPHITE RIBBON

PACKING RING

(KEY 7)

PACKING

FOLLOWER (KEY 13)

LANTERN RING

(KEY 8)

PACKING BOX

RING (KEY 11)

NOTE:

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

A6747

9.5 mm

(3/8 INCH)

STEM

12.7 mm

(1/2 INCH)

STEM

19.1, 25.4, OR 31.8 mm

(3/4, 1, OR 1‐1/4 INCH)

STEM

GRAPHITE FILAMENT

PACKING RING

(KEY 7)

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

Packing Maintenance

This section covers PTFE V‐ring, double PTFE, and graphite packing used in extension bonnets (figures 2, 3, and 4).

Note

If the valve has ENVIRO‐SEAL live‐loaded packing installed, refer to the instruction manual ENVIRO‐SEAL Packing System for Sliding

Stem Valves for packing instructions. Figure 6 shows typical ENVIRO‐SEAL arrangements.

Standard packing key numbers are shown in figures 2, 3, and 4. ENVIRO‐SEAL packing key numbers are shown in

figure 6. Bonnet key number locations are shown in figure 7, and valve key numbers are shown in figures 8 and 9.

For spring‐loaded single PTFE V‐ring packing, the spring (key 8) maintains a sealing force on the packing. If leakage is

noted around the packing follower (key 13), 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 nuts (key 5), until the shoulder is against

the bonnet. If leakage cannot be stopped in this manner, proceed with replacing packing procedures.

If there is undesirable packing leakage with other than spring‐loaded packing, first try to limit the leakage and

establish a stem seal by tightening the packing flange nuts.

If the packing is relatively new and tight on the stem, and if tightening the packing flange nuts does not stop the

leakage, it is possible that the valve stem is worn or nicked so that a seal cannot be made. The surface finish of a new

valve stem is critical for making a good packing seal. If the leakage comes from the outside diameter of the packing, it

is possible that the leakage is caused by nicks or scratches around the packing box wall. If performing any of the

following procedures, inspect the valve stem and packing box wall for nicks and scratches.

Replacing Packing

WARNING

Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.

Key numbers and sequence of assembly of packing parts are shown in figures 2, 3, and 4. Bonnet key number locations

are shown in figure 7, and valve key number locations are shown in figures 8 and 9, unless otherwise noted.

1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the

process media from both sides of the valve. If using a power actuator, also shut off all pressure lines to the power

actuator, and release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures

stay in effect while you work on the equipment. Observe the Warnings at the start of the Maintenance section.

2. Disconnect the operating lines from the actuator and any leak‐off piping from the bonnet. Disconnect the stem

connector and remove the actuator from the valve by unscrewing the yoke locknut (key 15) or hex nuts (key 26, not

shown).

3. Loosen the packing flange nuts (key 5) so that the packing is not tight on the valve stem. Remove any travel

indicator parts and stem locknuts from the valve stem threads.

WARNING

D To avoid personal injury or property damage caused by uncontrolled movement of the bonnet, loosen the bonnet by

following the instructions in the next steps.

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

Do not remove a stuck bonnet by pulling on it with equipment that can stretch or store energy in any other manner. The

sudden release of stored energy can cause uncontrolled movement of the bonnet.

D To avoid personal injury or damage to the seating surface caused by the valve plug and stem assembly dropping from

the bonnet after being lifted out of the valve body, observe the following instructions.

4. When lifting an EZ‐C bonnet, temporarily install a valve stem locknut on the valve stem. This locknut will prevent

the valve plug and stem assembly from dropping out of the bonnet.

5. When lifting an ET‐C or EWT‐C bonnet, be sure the plug and stem assembly and cage remain in the valve body.

WARNING

To avoid possible personal injury, review your process shutdown procedures to be sure process pressure is not applied to

the valve for the following procedure.

6. Hex nuts (key 16) attach the bonnet to the valve body (key 1). Loosen these nuts or cap screws approximately 3 mm

(1/8 inch). Then, loosen the body‐to‐bonnet joint by either rocking the bonnet or prying between the bonnet and

valve body. Work with a prying tool around the bonnet until the bonnet loosens.

Table 3. Recommended Torque for Packing Flange Nuts

VALVE STEM DIAMETER PRESSURE

RATING

GRAPHITE PACKING PTFE PACKING

Minimum Torque Maximum Torque Minimum Torque Maximum Torque

mm Inch NSm Lbf‐in NSm Lbf‐in NSm Lbf‐in NSm Lbf‐in

9.5 3/8

150 3 27 5 40 1 13 2 19

300 4 36 6 53 2 17 3 26

600 6 49 8 73 3 23 4 35

12.7 1/2

150 5 44 8 66 2 21 4 31

300 7 59 10 88 3 28 5 42

600 9 81 14 122 4 39 7 58

19.1 3/4

150 11 99 17 149 5 47 8 70

300 15 133 23 199 7 64 11 95

600 21 182 31 274 10 87 15 131

25.4 1

150 19 169 29 254 9 80 14 120

300 26 226 38 339 12 108 18 162

600 35 310 53 466 17 149 25 223

31.8 1‐1/4

150 27 238 40 357 13 113 19 169

300 36 318 54 477 17 152 26 228

600 49 437 74 655 24 209 36 314

Table 4. Body‐to‐Bonnet Torque Guidelines

VALVE SIZE, NPS

BOLT TORQUES(1)

Bolt Material(2)

B8M(3) or S20910 (XM‐19)(4)

NSm Lbf‐ft

1 122 90

1-1/2 or 2 91 67

3 163 120

4, 6X4, or 8X4 258 190

6, 8X6, or 12X6 522 385

8 or 10X8 712 525

1.Determined from laboratory testing.

2. For bolting materials not listed in table 4, contact your Emerson sales office or Local Business Partner for torque information.

3.SA193‐B8M strain hardened.

4.Hot rolled.

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

D If fluid leaks from the joint, it may indicate that process pressure is applied to the valve. Review your process

shutdown procedures, and be sure process pressure is not applied to the valve.

D If no fluid leaks from the joint, remove the nuts completely and carefully lift the bonnet off the valve body.

7. For EZ‐C valves, remove the stem locknut. Separate the valve plug and stem from the bonnet, and set the parts on a

protective surface to prevent damage to gasket or seating surfaces.

8. For ET‐C and EWT‐C: If it is necessary to remove and inspect the valve trim, refer to the following Trim Maintenance

section.

9. Remove the bonnet gasket (key 10) and cover the opening in the valve to protect the gasket surface and prevent

foreign material from getting into the valve body cavity.

10. Remove the packing flange nuts, packing flange, upper wiper, and packing follower (keys 5, 3, 12, and 13).

Carefully push out all the remaining packing parts from the valve side of the bonnet using a rounded rod or other

tool that will not scratch the packing box wall. Clean the packing box and metal packing parts.

11. Inspect the valve stem threads and packing box surfaces for any sharp edges which might cut the packing.

Scratches or burrs in the packing box surfaces could cause leakage or damage to the new packing. If the surface

condition cannot be improved by light sanding, replace the damaged parts.

12. If necessary, go to the Trim Maintenance procedures to remove, inspect or replace trim parts. Return to this

section when installing the bonnet on the valve body.

Installing the Bonnet

13. Remove the covering protecting the valve body cavity and install a new bonnet gasket (key 10), making sure the

gasket seating surfaces are clean and smooth. Then slide the bonnet over the stem and onto the stud bolts (key 15).

Note

Proper performance of the bolting procedures in step 10 compresses the spiral wound gasket (key 12) or load ring (key 26) to both

load and seal the seat ring gasket (key 13). It also compresses the outer edge of the bonnet gasket (key 10) to seal the

body‐to‐bonnet joint.

The proper bolting procedures in step 14 include, but are not limited to, ensuring that bolting threads are clean and evenly

tightening the cap screws or nuts onto the studs in a crisscross pattern. Tightening one cap screw or nut may loosen an adjacent

cap screw or nut. Repeat the crisscross tightening pattern several times until each cap screw or nut is tight and the body‐to‐bonnet

seal is made.

Note

Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy

comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.

WARNING

Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or

assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the

serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design

or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification

mark visible. Contact your Emerson representative immediately if a discrepancy between actual parts and approved parts

is suspected.

Instruction Manual

D102175X012

EZ-C, ET-C, and EWT-C Valves

July 2017

14. Lubricate the bolting with anti‐seize lubricant and install it, using accepted bolting procedures during tightening,

so that the body‐to‐bonnet joint will withstand test pressures and application service conditions. Use the bolt

torques in table 4 as guidelines.

15. Install new packing and the metal packing box parts according to the appropriate arrangement in figures 2, 3, or 4.

Place a smooth‐edged pipe over the valve stem and gently tap each soft packing part into the packing box.

16. Slide the packing follower, upper wiper, and packing flange (keys 12, 13, and 3) into position. Lubricate the

packing flange studs (key 4) and faces of the packing flange nuts (key 5). Install the packing flange nuts.

17. Tightening packing flange nuts (key 5):

a. For spring‐loaded PTFE V‐ring packing, tighten the packing flange nuts until the shoulder on the packing follower

(key 13) contacts the bonnet.

b. For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 3.

Then, loosen the packing flange nuts, and retighten them to the recommended minimum torque shown in

table 3.

c. For double PTFE V‐ring packing, tighten the packing flange nuts alternately in small equal increments until one of

the nuts reaches the minimum recommended torque shown in table 3. Then, tighten the remaining nut until the

packing flange is level and at a 90 degree angle to the valve stem.

d. For ENVIRO‐SEAL live‐loaded packing, refer to the Fisher instruction manual titled: ENVIRO‐SEAL Packing System

for Sliding‐Stem Valves.

18. Mount the actuator on the valve assembly and reconnect the actuator and valve stem according to the procedure

in the appropriate actuator instruction manual.

Trim Maintenance

WARNING

Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.

This procedure describes how the valve trim can be completely disassembled. When inspection or repairs are required,

perform only those steps necessary to accomplish the task. Observe the Warning at the start of the Maintenance

section.

Key number locations are shown in figures 8 and 9, unless otherwise noted.

EZ‐C Trim Disassembly

Key number locations are shown in figure 8, unless otherwise noted.

1. Remove the actuator and the bonnet according to steps 1 through 9 of the Replacing Packing procedures in the

Maintenance section.

WARNING

To avoid personal injury due to leaking fluids, avoid damaging gasket sealing surfaces.

The surface finish of the valve stem (key 7) is critical for making a good packing seal.

The seating surfaces of the valve plug (key 2) and seat ring (key 9) are critical for proper shutoff.

Protect these surfaces accordingly.

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