Peter Paul supplies compensated plunger in all cases at no extra charge.
What is a “Compensated Plunger”?
The “Compensated Plunger” permits the top insert to move up and down thus providing long life and bubble-tight sealing at the top orifice. The design provides a metal jacketed top insert that is spring loaded. This plunger is offered with various insert materials to suit different applications. It is offered with Standard Buna-N (no charge). FKM, EPDM, Neoprene, Teflon, Kel-F or Nylon insert material are available.
Why is a Compensated Plunger is used?
A general property of rubber products is to dry, shrink and harden with the application of heat. Another property is the change in volume and swelling that takes place in liquids. Various liquids and chemical formulations will affect different insert materials to varying degrees. The specific advantages of a compensated plunger are when:
- A liquid media is being used in a Three Way Valve or a Two Way Normally Open Valve.
- A Three Way Valve or a Two Way Normally Open Valve is continuously energized for two hours or longer.
- A Three Way Valve or a Two Way Normally Open Valve is operating at a high cycle rate (greater than 200 C.P.M.)
- A Three Way Valve or a Two Way Normally Open Valve is operating at a long duty cycle (such as “On Time”=1 hour, “Off Time” = 10 minutes)
- A Three Way Valve or a Two Way Normally Open Valve is “dead ending” (no flow when energized) for repetitive cycles that have an “On Time” greater than 1 1/2 hours.
- A Three Way Valve or a Two Way Normally Open Valve is being used with media of excessive temperature.
- A combination of the above-consult factory on any questionable applications.