The output from this pressure pilot can be used to throttle control valves to maintain a constant field adjustable pressure setting. The 2800 Series are used with both back pressure valves and pressure reducing valves. The pilot will control pressure on separators, vessels, flow lines or any location where the pressure must be maintained at a constant level.
The signal pressure is applied to two opposing diaphragms. The upper diaphragm is larger than the lower diaphragm. As a result, signal pressure tries to move the diaphragm assembly up. Adjustable spring tension opposes this movement. The diaphragm assembly moves upward when the pressure is sufficient to overcome this spring tension. This closes the supply and opens the output port to exhaust. The opposite occurs when signal pressure decreases. The diaphragm assembly moves downward closing the exhaust, then opening the supply valve. This combination creates a throttling action that maintains a desired output for the pressure setting required. Output from 0 to full supply pressure is proportional-to-signal pressure. The 2800 Series is a non-bleed, reverse acting type pilot.
25 psig to 350 psig maximum, liquid or gas
5 to 50 psi, air or gas
0 to full supply
|Temperature:||-20ºF to +180ºF; available to 240ºF|
Center housing: aluminum (available in stainless steel)
Lower housing: aluminum
Spring housing: cast iron
Nylon reinforced nitrile (available in fluorocarbon)
|Connections:||All 1/4″ NPT|