Plast-O-Matic on How to Choose Relief Valves

03 September 2019

Plast-O-Matic Valves Inc. has recently released new 2-port and 3-port relief valves. The differences between a 2-Port Relief Valve and a 3-Port Relief Valve are as follows:

Advantages of a 2-Port Design
- 2-port relief valve can also be used as a backpressure regulator and an anti-siphon valve; 3-port cannot.
- Choice of in-line or angle pattern increases versatility in piping design.
- Flow capacity is better; 2-port valves provide less restriction and less deadleg.

Advantages of a 3-Port Design
- Smaller “footprint” in a system.
- No need for additional piping tee.
- Easy replacement in existing systems using 3-port valve.

In most relief and by-pass applications, 3-port valves do not perform as well as 2-port valves installed on a tee. No 3-port relief valve is suitable for use as a backpressure regulator or anti-siphon valve, and no 3-port relief valve will deliver the flow and performance of a Plast-O-Matic 2-port relief valve.

Image credit: Plast-O-Matic