Products / Relief Valves
 

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Relief Valve Documentation
 
Information Sheet (pdf)
 
Why Use Relief Valves? (pdf)
 
BOM & Specifications (pdf)
 
Instruction Manual (pdf)
 
 
Performance Curves
 
RV1000-LP & RV1001-LP (pdf)
 
RV1000 & RV1001 (pdf)
 
RV1000-HP & RV1001-HP (pdf)
 
RV2000-LP (pdf)
 
RV2000 & RV2001 (pdf)
 
 

 
   
 Relief Valves  
 
   
  "Every Positive Displacement Pump Needs Relief"
 

Positive Displacement (PD) pumps should always be installed with a Relief Valve in the discharge line, to protect the pump and piping against any type of line blockage, including the inadvertent closing of an isolation valve. Liquiflo manufactures two sizes of relief valves in both 316 Stainless Steel and Alloy-C.

Nine standard Liquiflo Relief Valve models are available, based on the body material, the port size and the pressure setting range (see chart below). The relief valves are factory preset to discharge at the pressures shown in the chart. Different pressure settings (within the Pressure Setting Range) can be specified when ordering.

 

Liquiflo Relief Valve basic material
is made of corrosion-resistant
316 Stainless Steel or Alloy-C

 

 
   
Specifications for Standard Liquiflo Relief Valves
 
Model #
Material
Port Size
& Type
Pressure Setting
Range (PSIG)
Factory Setting
Approx. Flow @ 25 PSI
over Factory Setting *
Min
Max
PSIG
GPM
LPM
 RV1000-LP
316 SS
½" NPT
25
65
50
5.8
22
 RV1000
316 SS
½" NPT
50
135
100
7.5
28
 RV1000-HP
316 SS
½" NPT
75
200
150
8.9
34
               

 RV1001-LP
Alloy-C
½" NPT
25
65
50
5.8
22
 RV1001
Alloy-C
½" NPT
50
135
100
7.5
28
 RV1001-HP
Alloy-C
½" NPT
75
200
150
8.9
34
               
 RV2000-LP
316 SS
1" NPT
25
75
50
19
72
 RV2000
316 SS
1" NPT
50
175
100
25
95
               
 RV2001
Alloy-C
1" NPT
50
175
100
25
95
   
   
LP = Low Pressure       HP = High Pressure

* Test Conditions:  Water @ 70°F; discharge to atmospheric pressure (0 PSIG).
   
   
 
 
Proper Relief Valve Hook-up: Relief valve should directly bypass the pump discharge line back to the supply tank, as shown below. This is to ensure that the pump will not overheat if left running in a relieved condition.
 
   
 
 
 
Liquiflo Relief Valve Cross-Section & Design Features:
 

 
Products / Relief Valves