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Design CAV4

11

Figure 8. Typical Balanced TSO Trim

VALVE PLUG
SEAL

PROTECTED
SOFT SEAT

A7089 / IL

CAUTION

Hold the power torque wrench and at-
tached socket wrench extension at right
angles to the cage retainer when apply-
ing torque. Tilting the wrench and exten-
sion while applying torque causes the
lugs on the cage retainer tool to sudden-
ly disengage from the recesses in the
retainer, damaging the retainer and the
lower cage assembly (key 2).

e.  Remove the cage retainer (key 5).

f.  Remove the seat ring (key 35) and O-ring (key
36), if used.

6.  The 4 and 6-inch lower cage assemblies (key 2)
have tapped holes to aid in removal. Refer to table 7
for hole diameter and thread type. Install eyebolts or
similar devices into these holes. Carefully lift the lower
cage assembly (key 2) straight out of the valve body.

7.  Remove the cage gasket (key 7).

Table 7. Hole Diameter and Thread Type for Cage Removal

Valve Size,

Inch

Upper Cage

Lower Cage

Assembly

2

2 holes, 1/4-20 UNC

- - -

3

2 holes, 3/8-16 UNC

4 holes, 1/4-20 UNC

4

2 holes, 3/8-16 UNC

4 holes, 1/4-20 UNC

6

2 holes, 1/2-13 UNC

4 holes, 3/8-16 UNC

CAUTION

The seat ring (key 35) or integral seat
cage assembly (key 2) has a soft metal
seat. To avoid damage to the seating
surfaces, DO NOT lap this surface. If this
area needs repair, contact your Fisher
Controls sales representative or sales
office for assistance.

Trim Replacement

Note

The 3-inch CAV4 valve is a clamped-in
trim design. No cage retainer is used.
See figure 10. Therefore, if you are using
these instructions for a 3-inch valve, dis-
regard references to a cage retainer.

After all trim maintenance has been completed, re-
assemble the trim by following the steps below.

Be certain that all gasketed surfaces are clean. Use
new gaskets (keys 6 and 7) during assembly.

1.  If the lower cage assembly (key 2) and cage retain-
er (key 5) remained in the valve body (key 1), proceed
to step 4.

If these parts were removed, read the following caution
and proceed to step 2:

CAUTION

To avoid galling or improper gasket
loading that may result in leakage, thor-
oughly clean the threads and the gasket
surfaces in the valve body (key 1), the
valve body bore, and the cage retainer
(key 5). Lubricate the surfaces indicated
in figure 9 with the appropriate lubricant.
Be certain to lubricate all of the follow-
ing mating surfaces:

cage retainer and valve body

threads,

bottom of the cage retainer and top

of the flange on the lower cage assem-
bly.

Содержание Design CAV4

Страница 1: ...sher Controls sales office or sales representative before proceeding Figure 1 Design CAV4 Control Valve with Type 657 Actuator W2700 1 IL TYPE 657 ACTUATOR DESIGN CAV4 CONTROL VALVE Description The Design CAV4 control valve shown in figure 1 is an angle valve with soft metal to metal seats Cavitrol IV trim cage guiding and push down to close valve plug action Figure 8 shows a typical balanced TSO ...

Страница 2: ... Fisher Controls test requirement of no leakage at time of shipment using ANSI ISA Class V procedures Piston Ring Construction Class IV per ANSI FCI 70 2 All Others Class VI per ANSI FCI 70 2 Flow Direction In through the side connection and out the bottom connection Flow Characteristic Linear Port Diameters and Unbalance Area See table 2 or table 3 for TSO trim Minimum Seating Force First refer t...

Страница 3: ...e TRIM column Table 4 Approximate Weights VALVE SIZE INCH YOKE BOSS DIAMETER TOTAL BONNET ONLY VALVE PLUG AND STEM ASSEMBLY LOWER CAGE ASSEMBLY UPPER CAGE INCH mm Inch Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb 2 91 3 9 16 167 369 44 98 3 7 12 27 4 9 2 127 5 182 401 59 130 3 7 12 27 4 9 3 91 3 9 16 301 664 47 103 5 12 14 30 7 16 4 91 or 127 3 9 16 or 5 532 1172 127 280 12 27 37 82 12 27 4 178 7 554 1222 150 33...

Страница 4: ...h Cavitrol IV trim liquid flow enters the valve through the side connection and enters the cage through the top set of holes as shown in figure 3 No significant pressure drop occurs across the set of holes because the flow area is relatively large As the liquid flows down through the cage it undergoes four staged pressure drops by flowing through four addi tional sets of holes All significant thro...

Страница 5: ...tor cannot suddenly open or close the valve Use bypass valves or completely shut off the process to isolate the valve from process pressure Relieve process pressure on both sides of the valve Drain the process media from both sides of the valve Vent the power actuator loading pressure and relieve any actuator spring precompression Use lock out procedures to be sure that the above measures stay in ...

Страница 6: ...re the shoulder on the packing follower is touching the bonnet If the shoulder is not touching the bonnet tighten the packing flange nuts key 15 until the shoulder is against the bonnet If leak age cannot be stopped in this manner replace the packing as described in the Packing Replacement pro cedure For PTFE composition or graphite ribbon filament packing figure 5 leakage around the packing follo...

Страница 7: ...threads CAUTION When lifting the bonnet key 12 be sure that the valve plug and stem assembly key 4 remains on the seat This will avoid damage to the seating surfaces as a result of the assembly dropping from the bonnet after being lifted part way out The bonnet is easier to handle sepa rately 4 Unscrew the large hex nuts key 27 that secure the bonnet key 12 to the valve body Carefully lift the bon...

Страница 8: ...s key 6 and the cage gasket key 7 During trim removal inspect the seating surface of the plug and lower cage or seat ring Also inspect the in side diameter of the lower cage If the seating surfaces need to be refinished or if the inside diameter of the lower cage has plugged holes deep scratches or oth er signs of wear the cage retainer and lower cage as sembly must be removed A seat ring or lower...

Страница 9: ... 74 25 2 24 9 990 980 6 17 7 17 4 695 685 19 1 75 54 0 2 12 31 8 1 25 88 9 3 50 201 7 201 5 7 942 7 932 182 6 7 19 205 7 205 5 8 100 8 090 25 2 24 9 990 980 1 Double dimensions indicate maximum and minimum values VALVE SIZE TORQUE SIZE INCH N m Lbf ft 2 1356 1000 3 N A N A 4 6100 4500 6 13 560 10 000 Recommended Materials Minimum Rockwell Hardness 416 stainless steel 28 17 4PH stainless steel 36 4...

Страница 10: ... surfaces Remove the protected soft seat seal Inspect the parts for damage and replace if need ed 4 The upper cage key 3 has two tapped holes to aid in removal Refer to table 7 for the hole diameter and thread type Install eyebolts or similar devices into those holes then carefully lift the upper cage out of the valve body 5 Remove the lower bonnet gasket key 6 If removal of the lower cage assembl...

Страница 11: ... key 35 or integral seat cage assembly key 2 has a soft metal seat To avoid damage to the seating surfaces DO NOT lap this surface If this area needs repair contact your Fisher Controls sales representative or sales office for assistance Trim Replacement Note The 3 inch CAV4 valve is a clamped in trim design No cage retainer is used See figure 10 Therefore if you are using these instructions for a...

Страница 12: ...from rotating CAUTION Hold the power torque wrench and at tached socket wrench extension at right angles to the cage retainer when apply ing torque Tilting the wrench and exten sion while applying torque causes the lugs on the cage retainer tool to sudden ly disengage from the recesses in the retainer damaging the retainer and low er cage assembly e Tighten the cage retainer key 5 to the torque sh...

Страница 13: ... packing leakage as the valve is being put into service Retighten packing flange nuts as required After the valve is returned to service retighten the hex nuts key 27 to the torque listed in table 6 CAUTION The soft metal seat life can be seriously shortened if the following step is not carefully completed 12 Isolate the valve from the process and stroke the plug at least three times with maximum ...

Страница 14: ...less steel SST S31600 316 SST Standard Hi Temp 2 inch 31B9641X012 4 inch 31B7696X012 6 inch 31B9652X012 S17400 17 4PH stainless steel SST S31600 316 SST Characterized Hi Temp 2 inch 31B9641X022 Key Description Part Number 2 Lower Cage Assembly HT cont d 4 inch 31B7696X022 6 inch 31B9652X022 S17400 17 4PH SST H1075 Standard Lo Temp 2 inch 31B9642X012 3 inch 37B9440X012 4 inch 31B9649X012 6 inch 31B...

Страница 15: ...1975 C DOC 48A1977 C DOC 48A1976 C DOC 48A1975 C DOC APPLY LUB VIEW A A SEAL RING CONSTRUCTION ALL SIZES FLANGED BODY OUTLET DETAIL OF CLAMPED IN LOWER CAGE FOR 3 INCH VALVE DETAIL OF PISTON RING CONSTRUCTION 6 INCH VALVE ONLY LOW TEMP CAGE ASSEMBLY DETAIL OF STEM BALANCED CONSTRUCTION 2 4 INCH VALVES ...

Страница 16: ...35072 18 Never Seez Nickel Special Lubricant or equivalent not furnished with the valve 19 Packing Set See following table 20 Packing Box Ring See following table 21 Upper Wiper See following table 22 Packing Follower See following table 23 Packing Spring See following table 23 Lantern Ring See following table 24 Special Washer See following table 25 Stud Bolt steel 8 req d 127 mm 5 inch yoke boss...

Страница 17: ...E STEM DIAMETER VALVE PLUG TRAVEL ACTUATORS 1 VALVE PLUG MATERIAL 2 VALVE SIZE INCH mm Inch mm Inch ACTUATORS 1 Heat Treated 440C Stainless Steel S31600 316 SST Stainless Steel w CoCr A Seat Guide Seal Ring Construction 2 19 1 3 4 38 1 1 2 Group 1 42B0593X022 42B0594X022 3 19 1 3 4 51 2 Group 1 47B9380X022 4 19 1 25 4 25 4 25 4 3 4 1 1 1 64 64 64 64 2 1 2 2 1 2 2 1 2 2 1 2 Groups 1 402 403 Group 1...

Страница 18: ...1770X012 34B1773X012 38B0288X012 4 2 11 16 2 1 2 25 4 1 101 405 Std Characterized 31B9649X012 31B9649X022 28A1966X012 44B1770X012 34B1773X012 38B0288X022 406 Std Characterized 31B9649X012 31B9649X022 38B0288X032 VALVE SIZE PORT TRAVEL STEM DIAMETER ACTUATOR CHARAC KEY 8 KEY 37 KEY 9 KEY 10 SIZE INCH PORT INCH TRAVEL INCH mm Inch ACTUATOR GROUP CHARAC TERISTIC Seal Ring Anti Extrusion Ring Back Up ...

Страница 19: ...s Packing ring graphite filament 29 1D7520X0162 5 req d 14A1933X022 4 req d 14A7914X012 4 req d Packing box ring S31600 316 stainless steel 20 1J873335072 1J873435072 1J873535072 16A6087X012 14A7913X012 Common Parts Upper wiper felt not req d for graphite ribbon filament packing 21 1J872806332 1J872906332 1J873006332 Packing follower S31600 316 stainless steel 22 1E944735072 1H982335072 1H99843507...

Страница 20: ...ies or guarantees express or implied regarding the products or services described herein or their use or applicability We reserve the right to modify or improve the designs or specifications of such products at any time without notice Printed in U S A Fisher Controls International Inc 1980 1999 All Rights Reserved Cavitrol Fisher Fisher Rosemount and Managing The Process Better are marks owned by ...

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