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1.

  Remove the four bolts that hold the relief valve cover  

 

in place.

2.

  Remove the cover. The stainless steel adapter, with o-ring  

 

attached will be free to be removed simultaneous with the  

 

removal of the cover. Pull out the relief valve assembly.  

 

Note:

 the spring tension in the relief valve assembly is  

 

contained in the design of the relief valve; therefore, the  

 

relief can be removed in a one-piece spool-type assembly.

3. 

The relief valve seat and disc may be cleaned without  

 

disassembly of the relief valve assembly. If it is determined  

 

that the relief valve diaphragm and/or disc should be  

  replaced, the relief valve module can be readily  

 

disassembled without the use of special tools.

Repair Kits

Relief Valve Kits

 Order Code No. 

Kit No. 

Size in. 

mm

 

0887126 

RK 909 VT 

3

4

 – 1

 20-25

 

 

0887138 

RK 909 VT 

1

1

4

 – 2

 32-50

Kit includes:

 Relief valve assembly, Seat, Seat o-ring, Cover o-ring 

and lubricant.

Rubber Parts for Relief Valve

 

0887131 

RK 909 RV 

3

4

 – 1

 20-25

 

 

0887141 

RK 909 RV 

1

1

4

 – 2

 32-50

Kit includes:

 Diaphragm, Disc assembly, Seat o-ring, RV o-ring, 

Piston o-rings, Cover o-ring and lubricant.

Seat Kits for Relief Valve

 

0887372 

RK 909 SV 

3

4

 – 1

 20-25

 

 

0887371 

RK 909 SV 

1

1

4

 – 2

 32-50

Kit includes:

 Seat, Seat o-ring, Piston o-ring and lubricant. 

Note:

 1

1

4

" - 2" (32-50mm) 909/909M1 share a common kit.

To Prevent Shaft Damage Assemble As Shown:

Caution:

 If cover will not press against body, assembly is crooked and tightening bolts will bend shaft. Do not force the cover into 

place as damage may result from misalignment.

Figure 1

Figure 2

Figure 3

Figure 1:

To assemble the Relief Valve Assembly 

have a screwdriver ready.

Figure 2:

Depress the Relief Valve Assembly, 

carefully guiding it against the two pound 

spring load. When properly aligned, the 

piston is in the cylinder bore. Insert the 

screwdriver as shown.

Figure 3:

The Relief Valve Assembly is held 

encapsulated by the screwdriver. You 

should now have both hands free to 

bolt down the cover. Insert and snug 

two bolts 180° apart to hold the cover. 

Finish inserting the remaining bolts and 

snug up evenly, alternating until secure. 

Remove the screwdriver.

Disc Assembly

Piston 

O-ring

Relief Valve 

Assembly

RV O-Ring

Stem

Seat

Body

Cover

Diaphragm

Piston

6

Cover

Seat 

O-ring

Size 

3

4

” – 1”

Disc Assembly

(2) Piston 

O-rings

Relief Valve 

Assembly

(2) RV O-Rings

Stem

Seat

Diaphragm

Piston

Seat 

O-ring

Size 1

1

4

" – 2" (32-50mm)

For further details contact your local technical sales 

representative, see back page. 

Servicing the Relief Valve

 3

/

4

" to 2"

Summary of Contents for 909 Series

Page 1: ...E COMPANY MAKES NO OTHER WARRANTIES EXPRESS OR IMPLIED THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANT...

Page 2: ...ofthereliefvalveispositionedbelowthe first check This unique feature allows the valve to be installed either vertically or horizontally 7 Installation procedures must comply with all state and local c...

Page 3: ...d in an accessible location to facilitate testing and servicing A discharge line should be piped from the air gap at the relief valve connection making sure there is adequate drainage Never pipe the d...

Page 4: ...No 2 Step 2 Close test cock No 4 Disconnect bypass hose yellow at test cock No 4 Step 3 Open needle valve B low blue and C bypass yellow bleeding to atmosphere then closing needle valve B blue restor...

Page 5: ...el Seat Second Check Kits 0887121 RK 909 CK2 3 4 1 20 25 0887134 RK 909 CK2 11 4 2 32 50 0887123 RK 909 CK2SS 3 4 1 20 25 0887136 RK 909 CK2SS 11 4 2 32 50 Kit includes Disc assembly Spring Seat Seat...

Page 6: ...4 1 20 25 0887371 RK 909 SV 11 4 2 32 50 Kit includes Seat Seat o ring Piston o ring and lubricant Note 11 4 2 32 50mm 909 909M1 share a common kit To Prevent Shaft Damage Assemble As Shown Caution If...

Page 7: ...s not resolve problem disassemble valve and clean or replace the first check B 2 Clean or replace the relief valve seat B 3 Clean grease or replace the piston O ring B 4 Eliminate source of excessive...

Page 8: ...eb site at www watts com RP IS 909S 1111 EDP 0834246 2011 Watts USA No Andover MA Tel 978 688 1811 Fax 978 794 1848 www watts com Canada Burlington ON Tel 905 332 4090 Fax 905 332 7068 www wattscanada...

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