Document P/N:
2A44778_SVC_MNL
Release Date:
07/29/2019
Revision: 1.0
6 of 23
Valve Box
– Stainless steel enclosure with the static pressure regulator, electronic pressure regulator, solenoid dump valve, and
pressure transducers.
N
2
Relief Valve –
Weir SPM's Emergency Back Pressure Relief Valve provides over-pressure protection for reciprocating pumps,
treating lines, pressure vessels, and other equipment operating under high-pressure, high-flow conditions. Compact and simple to
operate, the valve is direct acting, relying on the system's hydraulic pressure to overcome a preset nitrogen gas force to relieve.
Dome –
shorthand way to refer to the N
2
Relief Valve’s nitrogen filled chamber.
RIO –
The National Instruments controller inside the suitcase. Runs all the logic and web pages.
Router –
The main network hub inside the suitcase.
Touchscreen Interface –
The touchscreen that displays the web page on the suitcase.
1.2 System Terminology
Wellhead Pressure –
the pressure in the line or vessel that the relief valve is protecting. Also referred to as treating pressure.
Bottle Pressure –
the nitrogen supply pressure, measured after the system’s internal regulator.
Dome Pressure –
the nitrogen pressure in the dome that holds the relief valve closed.
Pop-off
– Event where the pressure trip point is exceeded for the defined interval and the system opens the relief valve.
Reset
– Event, after a pop-off event, where the system closes the relief valve and allows pressure to resume in the treating line.
Dump –
When the user empties the dome with a physical or software switch allowing the relief valve to vent.
Auto –
When the dump switch is in the
Auto
position the system maintains sufficient nitrogen pressure to hold the relief valve
closed until the pop-off conditions are met.
10-pin Connector to Suitcase
Nitrogen Line Out
Event Indicator Lights
Pressure Transducer
Calibration Switch
Nitrogen Supply In
