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DESCRIPTION

The INVALCO Series 504 Valve is perfect for maintaining back pressure on vent lines from separators, treaters, dehydrators, compressor stations, gas gathering systems, etc.

Specifications

Body	Ductile A-395
Diaphragm Case	Steel, 26 sq. in.
Containment Pressure	100 psi* (all models)
End Connections	2” FNPT
Diaphragm	Nylon reinforced Buna N
Temperature Limits	-20°F to 250°F**
Spring Ranges	0 to 100 psi (on next page).
Trim	416 Stainless with molded Viton plug, 1-3/4” orifice
Flow Capacity	Cg: 970 Cv: 28.5
Pressure Increase Required From Full Closed to Full Open Spring Range 0-25 psi 20-40 psi 40-60 psi 60-100 psi	Increase 2.7 psi 4.0 psi 9.5 psi 10.5 psi

FEATURES

Ductile Body - Meets a variety of application requirements.
Internal Sensing Line - Reduces the chance of blockage.
Nace Adaptable - Can be modified for use in sour service.

SETTINGS

Any spring combination may be set to open at less than 5 psi working pressure, but, because the heavier springs are less sensitive, it is recommended that valves be selected to suit the pressure range required. The valve will be factory set at midpoint of range selected.

INSTALLATION AND OPERATION

Valve is installed in the line so that flow pressure is exerted against the bottom of the plug. Line pressure is exerted against the diaphragm through the hollow stem connecting the diaphragm to the plug. When flow pressure exceeds the spring setting pressure, valve opens and allows excess pressure relief through the orifice of the valve and down the flow line. As pressure is relieved, spring pressure returns the plug against the seat for positive seal. All parts are interchangeable with the Series 503 Cast Iron RDSG-201 and RDSG-301.

ADDITIONAL INFORMATION

General Notes
1. Refer to valve engineering section for valve sizing charts.
2. Cg-Cv is for fully opened valve.
3. Part numbers valid only if valve desired is exactly as described.

*Containment pressure is maximum working pressure and is limited by diaphragm case. However, pressures above the maximum spring setting are uncontrolled and the back pressure valve will be fully open.
**Limited by diaphragm.

Note: Dimensions – Inches to the nearest tenth (millimeters to the nearest whole mm), each independently dimensioned from respective engineering drawings.