Model 19: All bronze, equipped with handwheel for easy adjustment.
Model 19M: Same as Model 19 except SS trim (seat and disc). (Available 2 1/2-inch and 3-inch only). For higher pressure settings or severe applications.
Model 20: All bronze, with pressure-tight cap. Suitable for maximum back pressure of 50 psig.
Model 20M: Same as Model 20 except SS trim (available in 2 1/2-inch and 3-inch only)(seat and disc). For higher pressure settings or severe applications. Maximum back pressure of 50 psig.
Model 20P: Same as Model 20 except with packed lift lever. Suitable for maximum back pressure of 50 psig.
Model 20MP: Same as Model 20M except with packed lift lever. Maximum back pressure of 50 psig.
Model 200A: Special non-chattering design. Recommended for light oils and continuous bypass or pressure regulation. UL listed for light oil service. Available 3/4-inch through 1 1/2-inch sizes. Female NPT connections only.
Model 200H: Same as Model 20. UL listed for use with fuel oils. Available 3/4-inch through 2-inch sizes.
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Model Descriptions
Model 19: All bronze, equipped with handwheel for easy adjustment.
Model 19M: Same as Model 19 except SS trim (seat and disc). (Available 2 1/2-inch and 3-inch only). For higher pressure settings or severe applications.
Model 20: All bronze, with pressure-tight cap. Suitable for maximum back pressure of 50 psig.
Model 20M: Same as Model 20 except SS trim (available in 2 1/2-inch and 3-inch only)(seat and disc). For higher pressure settings or severe applications. Maximum back pressure of 50 psig.
Model 20P: Same as Model 20 except with packed lift lever. Suitable for maximum back pressure of 50 psig.
Model 20MP: Same as Model 20M except with packed lift lever. Maximum back pressure of 50 psig.
Model 200A: Special non-chattering design. Recommended for light oils and continuous bypass or pressure regulation. UL listed for light oil service. Available 3/4-inch through 1 1/2-inch sizes. Female NPT connections only.
Model 200H: Same as Model 20. UL listed for use with fuel oils. Available 3/4-inch through 2-inch sizes.
Pressure and Temperature Limits
Model 19, 20: 1 to 300 psig -60° to 406°F
Models 19M, 20M: 1 to 500 psig -60° to 406°F
Models 200A, 200H: 10 to 200 psig -60° to 406°F
Applications
Non-Code liquid relief
Overpressure relief and protection of pumps, tanks, lines and hydraulic systems
Pressure regulation
Continuous bypass relief
Options
Available with optional female NPT inlet or flanged inlet and outlet connections.
Male x Female NPT connections standard.
Female x Female connections available.
Features and Benefits
Inlet and outlet connections integrally cast into body to permit easy inspection and servicing without disconnecting piping.
Lapped beveled seats for optimum performance.
Stainless Steel Spring for optimum corrosion resistance.
