Relief valve

Pressure Relief Valves

Recommended for all cold water system installations – to protect against damage to piping and pressure tanks.  PRV are set at 75 psi or 100 psi – adjustable from 75 to 150 psi.  PRV have a +/- 15% setting accuracy.

chart

 

Chart Reflects 3/4″ Valve

NOTE: These valves are not T&P valves that are required with water heaters.  There is the same need for PRV on cold water pressure tanks.

NOTE: Merrill Manufacturing™ pressure relief valves may not reseat themselves after pressure relief.  Manual disassembly and reseating of valve may be required.  Repeated opening of a pressure relief valve is beyond intended use and voids warranty.

WARNING: All PRV, SSPRV, PRVNL, PRVHD and PRVHDNL valves must be set a minimum of 15 psi above the typical high of the water system pressure, so valve chatter or rapid open and close will not occur.  Valve chatter can cause failure of the valve and voids warranty.

NOTE: All PRV valves are field adjustable – but removing cap and turning internal disk down to increase pressure.  Field adjustment of valve voids warranty.

NOTE: Valve warranty void after change in adjustment due to possible error.

  • Can be used in both vertical and horizontal positions.
  • Merrill Manufacturing™ check and foot valves are individually boxed.

PRV75

Order No. UPC Bar Code (Qty. 1) Inlet x Outlet Ctn. Qty. Ctn. Wt./Lbs.
*PRV50 6 42367 02251 8 1/2″ x 1/2″ 10 3.5
PRV75 6 42367 02252 5 3/4″ x 1/2″ 10 3.8
•PRV50100 6 42367 11074 1 1/2″ x 1/2″ 10 3.5
•PRV75100 6 42367 11075 8 3/4″ x 1/2″ 10 3.8
•PRV757100 6 42367 11076 5 3/4″ x 3/4″ 10 3.9

* A perfect companion to Merrill Manufacturing™ galvanized tank tees 1X, 100X, 102X and 125X.
• Valves set at 100 psi

SSPRV50

Order No. UPC Bar Code (Qty. 1) Inlet x Outlet Ctn. Qty. Ctn. Wt./Lbs.
Ø SSPRV50 6 42367 12289 8 1/2″ x 1/2″ 10 3.0
Ø SSPRV75 6 42367 12290 4 3/4″ x 1/2″ 10 5.0
Ø SSPRV75775 6 42367 43419 9 3/4″ x 3/4″ 10 5.2
Ø •SSPRV50100 6 42367 12942 2 1/2″ x 1/2″ 10 3.0
Ø •SSPRV75100 6 42367 12943 9 3/4″ x 1/2″ 10 5.0
Ø •SSPRV757100 6 42367 43420 5 3/4″ x 3/4″ 10 5.2

• Valves set at 100 psi

PRVNL50

Order No. UPC Bar Code (Qty. 1) Inlet x Outlet Ctn. Qty. Ctn. Wt./Lbs.
♦ PRVNL50 6 42367 08885 9 1/2″ x 1/2″ 10 3.5
♦ PRVNL75 6 42367 08886 6 3/4″ x 1/2″ 10 3.8
Ø PRVNL757 6 42367 41251 7 3/4″ x 3/4″ 10 3.9
Ø •PRVNL50100 6 42367 12471 7 1/2″ x 1/2″ 10 3.5
Ø •PRVNL75100 6 42367 12472 4 3/4″ x 1/2″ 10 3.5
Ø •PRVNL757100 6 42367 12473 1 3/4″ x 3/4″ 10 4.0

• Valves set at 100 psi

PVCPRV50

Order No. UPC Bar Code (Qty. 1) Inlet x Outlet Ctn. Qty. Ctn. Wt./Lbs.
Ø *PVCPRV50 6 42367 11391 9 1/2″ MIP x 1/2″ FIP 1 .20

* A perfect companion to Merrill Manufacturing™ PVC tank tees 100C, 100CS, 100CSF and 1025CSF.

Approximage Relief in GPM from Heavy-Duty Pressure Relief Valves

Set psi 3/4″ 1″ 1-1/4″ 1-1/2″ 2″
50 15 25 44 68 132
60 16 28 48 75 145
70 17 30 52 81 156
80 19 32 55 87 167
90 20 34 59 92 177
100 21 36 62 97 187
110 21 36 62 97 187
120 23 39 68 106 205
130 24 41 71 110 213

PRVHD75

Order No. UPC Bar Code (Qty. 1) Inlet x Outlet Ctn. Qty. Ctn. Wt./Lbs.
PRVHD75 6 42367 04304 9 3/4″ x 3/4″ 1 1.6
PRVHD150 6 42367 05387 1 1-1/2″ x 1-1/2″ 1 5.5

NOTE: Merrill Manufacturing™ PRVHD valves can be factory adjusted to a custom setting upon request at extra cost.  Custom set relief valves are non-cancelable and non-returnable.  PRVHD’s are set at 75 psi.  PRVHD’s are  recommended for use up to 150 psi on water systems only.  PRVHD’s have a +/- 15% setting accuracy.  Field adjustment of valve voids warranty.

Order No. UPC Bar Code (Qty. 1) Inlet x Outlet Ctn. Qty. Ctn. Wt./Lbs.
Ø PRVHDNL75 6 42367 41210 4 3/4″ x 3/4″ 1 1.6
Ø PRVHDNL100 6 42367 41211 1 1″ x 1″ 1 2.7
Ø PRVHDNL125 6 42367 41212 8 1-1/4″ x 1-1/4″ 1 4.3
Ø PRVHDNL150 6 42367 41213 5 1-1/2″ x 1-1/2″ 1 5.5
Ø PRVHDNL200 6 42367 41214 2 2″ x 2″ 1 9.3

NOTE: Merrill Manufacturing™ PRVHDNL valves can be factory adjusted to a custom setting upon request at extra cost.  Custom set relief valves are non-cancelable and non-returnable.  PRVHDNL’s are set at 75 psi.  PRVHDNL’s are field adjustable and recommended for use up to 150 psi on water systems only.  PRVHDNL’s have a +/- 15% setting accuracy.  Field adjustment of valve voids warranty.

PRVHD75

Order No. UPC Bar Code (Qty. 1) Inlet x Outlet Ctn. Qty. Ctn. Wt./Lbs.
DPRV50 6 42367 642367 09301 3 1/2″ x 1/2″ 1 2.3
DPRV75 6 42367 09302 0 3/4″ x 3/4″ 1 2.3
DPRV100 6 42367 09303 7 1″ x 1″ 1 3.5
DPRV125 6 42367 09304 4 1-1/4″ x 1-1/4″ 1 5.0
DPRV150 6 42367 09305 1 1-1/2″ x 1-1/2″ 1 6.3
DPRV200 6 42367 09306 8 2″ x 2″ 1 11.0

NOTE: Domestic Heavy-Duty pressure relief valves available, factory set at 5 psi to 300 psi.  DPRV’s are set at 75 psi.  DPRV’s are field adjustable and recommended for use up to 300 psi on water systems only.  Field adjustment of valve voids warranty.  Special order non-stock item.