Types 166-2 & -4
Fisher Controls
Instruction Manual
Type 166-2 & -4 Regulators
July 1969 REMOTE VENT
GATE VALVE
Form 1435F
from this connection to the outdoors, and the vent fitting inserted in the end of the line. The remote vent line should be as short as possible with a minimum number of elbows. The pipe should be of the largest practical diameter.
BY PASS LINE
START-UP CONTROL LINE NEEDLE VALVE
MANUAL CONTROL VALVE
MANUAL CONTROL VALVE
Figure 1. Typical Installation, Type 166-2 or 4.
TYPE NUMBER EXPLANATION
Type 166-2—Industrial gas regulator for inlet pressure of 125* psi maximum, and reduced pressure ranging from 3" WC to 2 psi (five springs). Type 166-4—Industrial gas regulator for inlet pressure of 125* psi maximum, and reduced pressure ranging from 2 to 5 psi (one spring). *For maximum regulation should be limited to 60 psi.
accuracy,
inlet
pressure
INSTALLATION
Inspect all parts of the regulator for foreign material that may have collected during shipment, and clean and blow out pipe lines to remove pipe scale and chips. It is recommended that a strainer, such as a Fisher Type 260C, be installed ahead of the main valve. Install the body in the line so that flow is in the direction indicated by the arrow cast on the body. Figure 1 shows a typical 166 installation. If it is desirable to have continuous operation during regulator maintenance, install a three valve by-pass around the regulator. The downstream piping may be enlarged to obtain maximum capacity. If the body has screwed connections, use a good grade of pipe compound on the male theads. If the body is of flanged construction, draw the flange bolts up evenly. Connect a 3/4" control line from the tap in the lower casing to a straight run of pipe 6 to 8 pipe diameters downstream from the regulator, or any swage fittings. Install a needle valve in this line so the control pressure can be shut off. The needle valve can also be used to dampen out pulsations which may cause instability. The vent should be piped outdoors when the regulator is installed indoors, as illustrated in Figure 1. For remote vent installation, unscrew the vent from the regulator. A line is installed © Fisher Controls Insternational, Inc. 1987; All Rights Reserved
To put the regulator in operation: 1. Open the needle valve in the control line, check all pipe connections for leaks. 2. Slowly open downstream manual control valve. 3. Slowly open upstream manual control valve. 4. Close by-pass valve. 5. If the regulator has a tendency to pulsate, pinch down the needle valve in the control line. This valve should never be completely closed while the control valve is in operation. ADJUSTMENT
It is possible to change the pressure setting of the regulator within the limits specified on the pressure range plate, attached to the rim of the spring case. Observe the maximum inlet pressure figure given on this plate. To change the reduced pressure setting, remove the closing cap (Key No. 1, Type 166-2) or the adjusting screw cap (Key No. 55, Type 166-4), and turn the adjusting screw (Key No. 3) clockwise to increase, or counterclockwise to reduce the pressure setting. MAINTENANCE
Series 166 regulators should respond to downstream pressure changes with high sensitivity and accuracy. If this type of action is not being obtained, check the following: 1. Valve Plug—Examine the valve disks and seat rings for damage. If the synthetic rubber valve disks are damaged, they must be replaced. 2. Diaphragm—If the diaphragm is no longer pliable or is ruptured, it will have to be replaced. TO REPLACE VALVE DISKS
The rubber valve disks on the Type 166-2 and 4 regulators may be replaced without removing the regulator from the pipeline. To examine or replace the disks, follow this procedure. (See Figure 2) 1. Isolate the regulator in the pipe line.
D100272X012
Dwg. AJ2839
Page 2—Types 166-2 & -4 2. Remove the closing cap (Key No. 1), and relieve the spring tension by turning the adjusting screw (Key No. 3) out of the spring case. On the 166-4, this is done by removing the adjusting screw cap and backing off the adjusting screw. On the 166-2, removing the closing cap exposes the adjusting screw. 3. Remove the bottom flange (Key No. 37). 4. Loosen the set screws (Key No. 36) in the cage assembly (Key No. 34) and unscrew the cage and valve plug assembly from the valve body. 5. Remove the lower elastic stop nut, (Key No. 38), and anti-rotation bar (Key No. 33). Note: This must be done even if valve disks and O-rings are inspected only, and not replaced. 6. Remove valve stem nut (Key No. 32) and lower disk holder, O-ring, lower disk, and lower disk retainer will drop off the valve stem (Key No. 27). 7. Upper elastic stop nut can then be removed so that the upper disk retainer (Key No. 30), O-ring (Key No. 19), upper disk (Key No. 28), and upper disk holder (Key No. 29) will drop off the valve stem. 8. Replace valve disks and O-rings. 9. To reassemble valve plug, place upper disk holder, O-ring, upper valve disk, and upper disk retainer on valve stem. Secure with upper elastic stop nut. 10. Place valve stem in cage (Key No. 34) and install lower disk retainer, lower valve disk, O-ring, and lower disk holder on valve stem. Secure with valve stem nut (Key No. 32). 11. Replace O-ring (Key No. 35) on cage assembly. Lubricate O-ring on the cage with Dow Corning No. 3 or any suitable rubber lubricant. Use a small amount of Never-Seez (or equivalent) on male threads of the cage. 12. Turn the cage assembly completely into the body (Do not tighten). Screw the valve stem (Key No. 27) into the diaphragm rod (Key No. 18) until the upper elastic stop nut on the valve plug assembly shoulders against the diaphragm rod. (Do not tighten) 13. To make the seat-to-seat spacing adjustment, the upper valve disk (Key No. 28) is held against the upper valve seat (Key No. 31), and the cage is turned out of the body until the lower valve seat contacts the lower valve disk. 14. Lock the seat-to-seat adjustment by tightening the set screws (Key No. 36) in the cage against the body. 15. Rotate the valve plug assembly counterclockwise until the milled slot in the valve stem lines up with the cast slot in the cage. 16. Install the anti-rotation bar (Key No. 33) and secure in place with the lower elastic stop nut, (Key No. 38). 17. Replace the bottom flange and adjust the spring tension to the desired outlet pressure. TO REPLACE DIAPHRAGM
If the diaphragm needs to be replaced, it can be done with the body in the line, and without disturbing the seat-to-seat adjustment. (See Figure 2.) 1. Isolate the regulator in the line. 2. Remove the closing cap (Key No. 1). On Type 166-4, the adjusting screw cap (Key No. 55) first
has to be removed. 3. On the Type 166-2, turn the spring adjustor (Key No. 3) out of the spring casing, and spring (Key No. 5). On the 166-4, back off the adjusting screw, then proceed. 4. Remove the cap screws and nuts (Key Nos. 11 and 12) which hold the spring case to the diaphragm case. Lift the spring case off the assembly. 5. Grasp the diaphragm (Key No. 15) and the diaphragm head, and rotate the assembly counterclockwise until the diaphragm rod (Key No. 18) unscrews from the valve plug stem. 6. The diaphragm head and rod assembly can now be lifted out of the case. 7. Hold the diaphragm rod (Key No. 18) from turning, and unscrew the elastic stop nut (Key No. 17). Remove the lower spring seat (Key No. 13), and the diaphragm head, exposing the diaphragm (Key No. 15). 8. Replace diaphragm, diaphragm head, lower spring seat, and secure with elastic stop nut. 9. When the diaphragm rod was unscrewed from the valve stem, the valve stem assembly dropped into the bottom of the valve body. 10. Remove the bottom flange (Key No. 37), and push the plug and stem assembly up, so that the threads on the diaphragm rod and the stem engage. Screw up, so that Key No. 18 shoulders against the nut (Key No. 38). Do not tighten. 11. Replace the bottom flange. 12. Now rotate the diaphragm assembly counterclockwise, until the holes in the perimeter of the diaphragm line up with the holes in the diaphragm case. 13. Replace the spring case, spring, upper spring seat, and adjusting screw. Adjust the pressure setting of the regulator. Replace closing cap or the adjusting screw cap. TO REPLACE SEAT RINGS (See Figure 2)
Refer to section “TO REPLACE VALVE DISKS”, and remove the valve cage and plug as outlined in Steps 1 through 6. To replace the lower seat ring, unscrew it from the valve cage. Now refer to section “TO REPLACE DIAPHRAGM”, and proceed through Stop 6. To remove the upper seat ring, continue as follows: 1. Remove the cap screws holding the lower diaphragm case and head flange (Key No. 20) to the body. 2. The diaphragm case and head flange can now be removed, so that the seat ring is exposed. 3. Using a Fisher seat ring puller (Described in Green Sheet Page S-25) remove the upper seat ring (Key No. 31). 4. Reassemble, referring again to sections “TO REMOVE VALVE DISKS” Steps 9 through 17, and “TO REPLACE DIAPHRAGM”, Steps 8, 12 and 13. SERIAL NUMBER
Always refer to the serial number stamped on the nameplate in correspondence with the factory or sales representative about this equipment. When ordering replacement parts, include the complete
Page 3—Types 166-2 & -4
Parts Reference
View of 166-4 Closing Cap.
NS-NEVER-SEEZ DC-DOW CORNING NO.3 APPLY NEVER-SEEZ TO FACES OF GASKET PART NO. 21 & 22
Dwg. DH9946 Figure 2. Type 166-2.
part number of the desired parts. KEY
PART NUMBER
1 1A5895 4402 1N7564 1401 2* 3
1N4462 0699
PART NAME Closing Cap Type 166-2 Type 166-4
MATERIAL Die Cast Zinc Brass
1A5896 4402 1N7565 2898
Closing Cap Gasket Adjusting Screw 3" W.C. - 2 psi, Type 166-2 2 - 5 psi, Type 166-4
Die Cast Zinc Steel, CD PL
0Y0956 4401 1J3312 1401
Upper Spring Seat Type 166-2 Type 166-4
Die Cast Zinc Brass
000A 000A 000A 000A 000A
Spring, Type 166-5 3" - 5" W.C. 4" - 10" W.C. 8" - 20" W.C. 17" - 28" W.C. 3/4 - 2 psig
Steel, CD PL
1D8926 1D8928 1D8936 1D5276 1D7713 5 6 7 8 9 10 11
1J3315 1D5395 1D5295 1C9017 1D1780 1H9903 1D5296
000A 000A 000A 1507 1601 000A 2405
Spring, Type 166-4, 2 - 5 psi Upper Diaphragm Case Assembly Vent Assembly Flapper Valve Snap Ring Lower Diaphragm Case Assemblly Cap Screw, 24 Req'd
Steel, CD PL Steel Sub-Assembly Brass Phos. Bronze Steel Steel, CD PL
12
1A3093 2412
Hex Nut, 24 Req'd
Steel, CD PL
4
5
* Recommended Spare Part.
Neoprene
Page 4—Types 166-2 & -4 PART NUMBER
13
14 15* 17
0X0147 1J3316 1D4774 1U4290
4401 1401 2506 0205
PART NAME Lower Spring Seat Type 166-2 Type 166-4 Diaphragm Head, 2 Req'd. Diaphragm Stop Nut, 3 Req'd
1H7242 1899 1J7499 3899 18
19* 20
21* 22* 23 26
1H9904 1K7334 1K4362 1K4363 1A4185
1902 2201 0402 0402 2405
26 2N6266 2201 2K7332 2201 2N5243 2201 27
Brass SST
1H9896 1407 1H9896 3503 1H9899 0333
O-Ring, 3 Req'd Head Flange
Gasket Gasket, 2 Req'd Cap Screw, 16 Req'd Valve Body 2" Screwed 2" 125 lb. Flanged 2" 250 lb. Flanged Valve Body 2" Screwed 2" 150 lb. Flanged 2" 300 lb. Flanged Valve Stem
Disc, 2 Req'd Disc Holder, 2 Req'd
1H9898 1401 1H9898 3503 30
Cast Iron Steel Asbestos Asbestos Steel, CD PL Cast Iron
Steel
Brass SST Syn. Rubber
Disc Retainer, 2 Req'd
31
Brass SST Seat Ring, 2 Req'd
1H9897 1404 1H9897 3507 32
39 40 42 43 45 54* 55 57
Brass SST Syn. Rubber
Brass SST
1H9900 1401 1H9900 3503
33 34 35* 36 37
Die Cast Zinc Brass Steel, Zinc PL Syn. Rubber
Diaphragm Rod 1J3317 1407 1J3317 3503 1F2613 0699
1H9901 1902 1H9915 1902 2N3399 1902
28* 29
MATERIAL
Brass SST Valve Stem Nut
1H9910 1H9910 1H9908 2H9906 1H9912 1A3279
1401 3503 3899 0712 0699 2898
1H9913 1K7336 1H9916 1H9917 1H7207 1D7163 1A3524 1J9440 1J9441 1D7607
1901 2201 1899 1899 9901 2898 2412 0402 1401 2507
Valve Stem Locking Arm Cage O-Ring Screw, 4 Req'd Blind Flange
Nameplate, Serial No. (Not Shown) Nameplate, Pressure Rateing (Not Shown) Washer Washer, 8 Req'd. Nut, Type 166-4 Gasket, Type 166-4 Adjusting Screw Cap, Type 166-4 Stiffening Plate, Type 166-4
Brass SST SST Aluminim Syn. Rubber Steel, CD PL Cast Iron Steel Brass, Chr. PL Brass, Chr. PL Steel, CD PL Steel, CD PL Steel, CD PL Asbestos Brass Steel, Zinc PL
* Recommended Spare Part. While this information is presented in good faith and believed to be accurate, Fisher Controls does not guarantee satisfactory results from reliance upon such information. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding the performance,
Fisher Controls
merchantability, fitness or any other matter with respect to the products, nor as a recommendation to use any product or process in conflict with any patent. Fisher Controls reserves the right, without notice, to alter or improve the designs or specifications of the products described herein.
For Informationwrite: P.O. Box 190, Marshalltown, Iowa 50158, U.S.A. or Brenchley House, Maidstone, Kent ME 14 UQ, England
Printed in U.S.A.
KEY