background image

IOM-6987

4

9.  If available, collapse the piston spring (20) 

using the special tool from Figure 1.  If no 
special tool is available, proceed to Step 10.

10.  Place new diaphragm gasket (11) and       

diaphragms (10) onto body (1).

11.  Place multi-purpose, high temperature grease 

into depression of the pressure plate (8) and 
spring buttons (4) where the ball bearing (9) 
and ad just ing screw (3) bears. In the cen ter 
of the di a phragms (10), place the pres sure 
plate (8), ball bearing (9), spring but tons (4), 
and range spring (6).  Ensure spring buttons 
(4) are laying flat.

12.  Aligning the matchmarks, place spring 

cham ber (2) over the above stacked parts. 
Install flange bolts (13). Me chan i cal ly tight en 
flange bolts (13) in a cross pattern that allows 
the spring cham ber (2) to be pulled down 
even ly.  Tighten all flange bolts (13) to the 
following torque value:  

All Sizes: 45–50 Ft-

lbs (61–68 Nm).

 

NOTE:  

Never replace bolting (13) with 

just any bolting if lost. Bolt heads and nuts 
are marked with specification identification 
mark ings. Use only prop er grades as 
re place ments.

13.  Reinstall adjusting screw (3) with locknut (5).

14.  Spray liquid leak detector to test around flange 

bolts (13) and body (1) / spring cham ber (2) 
connection for leak age.  En sure that an inlet 
pressure is main tained dur ing this leak test 
of at least mid-range spring level; i.e. 50-100 
psig (3.4 - 6.9 Barg)  range spring, 75 psig 
(5.2 Barg) test pressure minimum.

C.  Renewal Unit Maintenance:

1.  Refer to previous pro ce dures, Sec tion VI.B. 

steps 1–7 to remove all parts above the 
re new al unit (17).

2.  Remove the piston spring but ton (17.3),       

piston (17.1) with piston o-ring (19), and the 
piston spring (20).

3.   Remove the cylinder (17.2) by turning CCW.

4.  Inspect seating surfaces of the piston (17.1) 

and cylinder (17.2).  If necessary, relap the 
seat ing sur face or replace renewal unit (17).

5.  Clean all parts to be reused according to 

own er's procedures.

 

NOTE: 

On reg u la tors 

orig i nal ly sup plied as “spe cial cleaned”,   
Option-55, main te nance must in clude a 
level of clean li ness equal to Cash co’s 
clean ing stan dard #S-1134.  On reg u la tors 
orig i nal ly sup plied as “spe cial cleaned”, 
Op tion-56, main te nance must in clude a level 
of cleanliness equal to Cash co’s clean ing 
stan dard #S-1542. Con tact fac to ry for details.

6.  Lubricate the cylinder (17.2) threads lightly 

with thread sealant.  Install the cylinder 
(17.2) into the body (1) and impact until 
approximately  100 Ft-lbs (136 Nm) torque 
value is reached.  This is a metal to metal seal.

7.  Install the piston spring (20) into the body 

(1) cavity.  Place the piston o-ring (19) into 
groove of piston (17.1) and install along with 
the piston spring button (17.3) into the cylinder 
(17.2).

8.  Refer to previous procedures, Section VI.B. 

steps 8–13 to replace all other parts.

9.  Bench test unit for suitable operation. 

NOTE:  

Reg u la tors are not tight shutoff devices. Even 
if pressure falls below set point, a regulator 
may or may not develop bubble tight shutoff. 

10.  Spray liquid leak detector to test around flange 

bolts (13) and body (1) / spring cham ber (2) 
connection for leak age.  En sure that an inlet 
pressure is main tained dur ing this leak test 
of at least mid-range spring level; i.e. 50-100 
psig (3.4 - 6.9 Barg)  range spring, 75 psig 
(5.2 Barg) test pressure minimum.

Содержание 6987

Страница 1: ...s continuous such that shutdown is not readily accomplished it is recommended that an inlet block valve outlet block valve and a manual bypass valve be installed 3 Pipe unions should be installed to allow removal from piping 4 An inlet pressure gauge should be located approximately ten pipe diameters upstream and within sight An outlet pressure gauge is optional 5 All installations should include ...

Страница 2: ...ge spring at maximum flow the inlet pressure should not exceed 1 5 x 100 psig 6 9 Barg or 150 psig 10 3 Barg If it does consult factory 12 Increase flow to maximum level if possible Inlet upstream or P1 pressure should fall off Readjust setpoint as necessary at the normal flow rate 1 Start with the block valves closed A bypass valve may be used to maintain inlet pressure in the upstream system wit...

Страница 3: ...ket 11 7 Inspectpressureplate 8 fordeformationdue to over pressurization If deformed replace 8 Clean all parts to be reused according to owner s procedures NOTE On regulators originally supplied as special cleaned Option 55 maintenance must include a level of cleanliness equal to Cashco s cleaning standard S 1134 On regulators originally supplied as special cleaned Option 56 maintenance must inclu...

Страница 4: ...ve the renewal unit 17 2 Remove the piston spring button 17 3 piston 17 1 with piston o ring 19 and the piston spring 20 3 Remove the cylinder 17 2 by turning CCW 4 Inspect seating surfaces of the piston 17 1 and cylinder 17 2 If necessary relap the seating surface or replace renewal unit 17 5 Clean all parts to be reused according to owner s procedures NOTE On regulators originally supplied as sp...

Страница 5: ...range spring screwing out CCW of adjustingscrewdoesnotallowbringingpressurelevel to a stable and proper level C Replace range spring with proper lower range Contact factory D Too much proportional band rise D1 D2 Review P B rise expected Contact factory E Restricted diaphragm movement E Ensure no moisture in spring chamber at temperatures below freezing Ensure no dust or debris entering vent openi...

Страница 6: ...mn A reflectminimum parts required for inspection and rebuild Soft Goods Kit Those in column B include minimum trim replacement parts needed plus those Soft Goods parts from column A If the BOM is not available refer to the cross sectional drawings included in this manual for part identification and selection ALocalSalesRepresentativewillprovidequotation for appropriate Kit Number Price and Availa...

Страница 7: ...ew Lock Nut 6 Range Spring 7 Diaphragm Ring upper range springs only See Figure 3 8 Pressure Plate 9 Ball Bearing 10 Diaphragms 11 Diaphragm Gasket 13 Flange Bolts 17 Renewal Unit 17 1 Piston 17 2 Cylinder 17 3 Piston Spring Button 19 Piston o ring 20 Piston Spring 24 Pipe Plug 7 8 9 4 17 3 10 19 Figure 3 Basic Model 6987 Metal Seat Range Springs from 200 psig to 800 psig ITEMS NOT SHOWN 16 Name P...

Страница 8: ...dual Essential Health and Safety Requirements are listed in Table 1 Table 2 lists all of the models and options that were evaluated and along with their evaluation Models and options not listed in Table 2 should be assumed to not have been evaluated and therefore should not be selected for use in a potentially explosive environment until they have been evaluated Standard default options for each l...

Страница 9: ...llow the same requirements for the piping system Also see item 30 in Table 1 2 The system designer and users must take precautions to prevent rapid system pressurization which may raise surface temperatures of system components and tubing due to adiabatic compression of the system gas 3 Heating systems installed by the user could possibly increase the surface temperature and must be evaluated by t...

Отзывы: