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A. 

All needle valves must be closed on test kit.

B. 

Open test cock No. 4 and flush test cocks Nos. 1, 2 and 3 on reduced pressure  

 

assembly then close test cock No. 4.

C. 

Attach hoses as shown. Bleed air from kit, close No. 2 shutoff.

909QT shown

No. 2 shutoff

Bleed Valve A

Bleed Valve B

High 

(red)

Bypass 

(yellow)

Low 

(blue)

Test No. 1 - Check Valve No.2

Purpose:

 To test check valve No. 2 for tightness against  

reverse flow.

Requirements:

 Valve must be tight against reverse flow under 

all pressure differentials.

Step 1

  Slowly open the needle valve “A” high side (red) and “C”  

 

bypass (yellow). Keep the “B” low (blue) closed.

Step 2

  Open test cock No. 4.

Step 3

  Indicated pressure differential will decrease slightly. If 

 

pressure differential continues to decrease (until the vent  

 

opens) the No. 2 check valve is reported as “leaking”.

Test  No. 2 - Shutoff Valve No. 2

Purpose:

 To test shutoff valve No. 2 for tightness.

Step 1

  After passing Test No. 1, continue to test No. 2 by  

 

closing test cock No. 2.

Step 2

  The indicated pressure differential will decrease slightly.  

 

If pressure differential continues to decrease 

 

(approaching “zero”), the No. 2 shutoff valve is reported  

 

to be “leaking”. 

Note:

 A leaking No. 2 shutoff will give a  

 

false reading in tests No. 3 and 4.

Test No. 3 - To Test No. 1 Check Valve

Purpose:

 To test check valve No. 1 for tightness.

Requirements:

 Valve must be tight against reverse flow under 

all pressure differentials.

Step 1

  Close needle valve “A” high side (red) and open test  

 

cock 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) restores the system to a normal  

 

static condition.

Step 4

  Observe the pressure differential gauge. If there is a 

 

decrease in the indicated value, the No. 1 check valve is  

 

reported as “leaking”.

Test No. 4 - Pressure Differential Relief Valve

Purpose:

 To test operation of pressure differential  

relief valve.

Requirements:

 The pressure differential relief valve must 

operate to maintain the “zone” between the two check valves 

at least 2psi less than the supply pressure.

Step 1

  Close needle valve “C” bypass (yellow).

Step 2

  Open needle valve “A” high side (red).

Step 3

  Open needle valve “B” low (blue) very slowly until the 

 

differential gauge needle starts to drop.

Step 4

  Hold the valve at this position and observe the gauge  

 

reading at the moment the first discharge is noted from  

 

the relief valve. Record this as the opening differential  

 

pressure of the relief valve. 

Note:

 it is important that the  

 

differential gauge needle drops slowly.

Step 5

  Close test cocks Nos. 2 and 3. Remove hose from test  

 

cocks Nos. 2 and 3.

Step 6

  Use bypass hose (yellow) to relieve pressure from test  

 

kit by opening needle valve “A”, “B” and “C” and bleed  

 

valves “A” and “B”.

Step 7

  Remove all test equipment and open No. 2 shutoff valve  

 

of the device.

4

CAUTION:

  To prevent freezing, hold Test Kit vertically to drain differential gauge and hoses prior to placing in case.   

For additional testing information, send for IS-TK-DP/DL, IS-TK-9A, IS-TK-99E or IS-TK-99D.

Test Procedure for Reduced Pressure Assembly

Содержание 909 Series

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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