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Relief Valve Cover Removal

The CDHS-20/ CDHS-24 RV
has two covers. The bellofram
cover (item 3) and the
intermediate body or “diaphragm
cover” (item 2).

The bellofram cover (item 3) is
located on top of the RV
assembly.

The bellofram cover is secured
by screws and sealed by the
bellofram.

There is no spring load on this
cover.

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Summary of Contents for 18-4

Page 1: ...Model 18 4 3 10...

Page 2: ...1 2003 Utilized the 3084 Toggle Lever Checks and CDHS 24 relief valve Produced in 3 10 sizes only Bypass was a RP 2 or a Wilkins 975XL Replacement hardware parts were discontinued in 2005 Only Repair...

Page 3: ...ing 8 and 10 sizes it is suggested that all thread rod and nuts jack screws be used when removing or replacing the covers The 8 size uses two 5 8 11 all thread approximately 8 long The 10 size uses tw...

Page 4: ...er arm pin item 13 and the hinge pin item 11 Using a brass rod smaller in diameter than the pins gently tap out the rear lever arm item 13 pin first CAUTION Support the lever arm item 10 while complet...

Page 5: ...the front hinge pin item 11 Lift out the toggle lever clapper assembly being careful that the brass seat is not dented NOTE On 8 and 10 sizes a lever arm spacer item 26 is installed between the two l...

Page 6: ...from the center of the disc guide 10 sizes only remove sixteen retaining screws from the disc guide item 5 The check disc is free once the guide is separated from the disc retainer item 4 NOTE An o r...

Page 7: ...ng sealed and pressed into the body Replacement seats are no longer in production Very fine nicks on the seating edge can be restored by slowly working 400 wet or dry sandpaper back and forth on both...

Page 8: ...ze on the disc item 6 Too many washers will not allow sufficient squeeze on the disc not a water tight seal This will cause the check valve to fail Too few washers between the guide and retainer can g...

Page 9: ...eat Support clapper assembly with one hand and install hinge pin With clapper assembly supported by hinge pin only exert pressure to force disc against the seat and leave an imprint of the seat in the...

Page 10: ...st hinge pin bushing OUT on the side that corresponds to the least distance between the seat imprint and disc guide In this figure adjust hinge pin bushing on the RIGHT side outward Alignment is corre...

Page 11: ...Check Reassembly Notes When the two pins that hold the toggle lever clapper assembly are installed be sure to note that the yoke item 7 and the lever arm pivots upward freely...

Page 12: ...covers The bellofram cover item 3 and the intermediate body or diaphragm cover item 2 The bellofram cover item 3 is located on top of the RV assembly The bellofram cover is secured by screws and seal...

Page 13: ...ed by cap screws and sealed by the diaphragm There is a slight spring load on this cover so exert pressure downward on the cover as the cap screws are removed The RV stem assembly is mounted through t...

Page 14: ...tem is secured by the upper and lower stem nuts item 16 Remove the upper stem nut first The bellofram piston and retainer can now be removed from the upper stem Remove the stem along with the diaphrag...

Page 15: ...m Remove lower stem nut item 16 The RV disc 9 disc retainer 8 and guide 10 are removed as one assembly Simply pry disc from retainer Remove the diaphragm item13 the lower stem o ring item 15 and washe...

Page 16: ...led and threaded into the main RV body Replacement seats are no longer in production Very fine nicks on the seating edge can be restored by slowly working 400 wet or dry sandpaper back and forth on bo...

Page 17: ...and washer item 7 on the lower stem 4 Reassemble the RV disc disc retainer and guide as one assembly on the lower stem The serrated area of the disc retainer 8 is positioned against the diaphragm Inse...

Page 18: ...on the upper stem and replace stem nut Position the retainer 6 with its outer lip facing up Position the bellofram with the glossy side against the retainer 6 The fabric side against the piston 5 Pos...

Page 19: ...over the seat in the main body Insert cap screws through intermediate body and diaphragm Make sure the sensing passage is aligned properly Press the intermediate body down on the main body and start c...

Page 20: ...itself so that the brim is flat and smooth against the intermediate body Make sure the bellofram is not twisted or wrinkled Install cover 3 so that weep hole faces out away from backflow Do not rotate...

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