Equilibar’s new Remote Sense Valve (RSV) provides improved pilot control options for vacuum applications.
In many vacuum applications, a filter or long run of piping exists between the vacuum regulator and the process. This makes it difficult to achieve accurate vacuum control because the vacuum control valve must compensate for significant pressure losses. For these applications, a remote sense device can help control the process directly to the desired pressure.
The new Equilibar RSV is a highly precise mechanical vacuum pilot with remote sense capability. It is designed to provide closed-loop control of an Equilibar vacuum regulator. The RSV actively adjusts the pilot reference vacuum level to maintain an extremely steady vacuum setpoint despite large variations in flow and process pressure drop.
The RSV has a remote sense port for a tube that can be connected to a line near the process to be controlled. The schematic below shows a process configuration with a filter creating a pressure drop between the controlled process and the Equilibar vacuum regulator. A remote sense line is installed between the RSV pilot regulator and the controlled process. 
The RSV works by using this remote sense input to carefully adjust the vacuum force that is applied to the pilot reference port of the Equilibar vacuum regulator.
During higher flow conditions, The RSV increases the reference vacuum level to open the vacuum regulator more fully. The opposite occurs during low flow conditions. This active pilot adjustment coupled with the instantaneous response of the Equilibar EVR keeps the pressure stable from the lowest flow rates to the maximum capacity of the EVR. The RSV can be integrated with any Equilibar vacuum regulator to provide remote sensing for improved vacuum control.
The graph below compares the performance of an EVR-GSD4 (1/2” inlet port) controlled in a standard open loop configuration, with the performance controlled in an RSV remote sense configuration. 
We believe the RSV will offer advantages for many of our vacuum customers. For more information, contact an application engineer at inquiry@equilibar.com
