1:1 Piston Separator Gauge Protector

Piston Separators & Isolators

The mud pressure piston separators & piston isolators manufactured by Crown Oilfield Instrumentation are made here in the U.S. and are made with high quality materials to assure durability and performance. Crown’s separators and isolators (also known as gauge protectors and gauge savers) stand up to the toughest conditions and provide long-lasting service.  Mud Pressure Separators and Isolators keep drilling mud and debris from damaging a pressure gauge’s costly internal parts all the while assisting in providing accurate pressure readings.  These simple but effective devices ensure that gauges and recorders will stand up to the harshest rig conditions.  Crown’s mud pressure  piston separator handles working pressures up to 15,000 psi that are delivered though a one-fourth inch hydraulic hose. Crown’s 1:1 piston isolator uses not only a piston but also a rubber diaphragm to keep well-fluids, such as cement, acid, and mud, from mud gauges or chart recorders, providing double the protection from these harsh fluids.

All Crown 1:1 Piston Separator Gauge Protectors are built to meet or exceed API specifcations. 

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Piston Separators

A mud pressure piston separator is a device that displays the pressure of well fluid to a remote gauge or recording device. Our 1:1 piston separators are designed to hold well fluids out of a pressure system’s internal parts and offer additional protection by using both a rubber diaphragm and a piston to separate the well fluid from the mud gauge or recorder.


Specify Your Order:

  • Sensor Type
  • Hammer Union Type
  • Hose Length (up to 140 ft.)


Piston Isolators

  • Capable of measuring pressures up to 15,000 psi
  • Available with 1502 or 2202 union and sub for either standard or H2S service
  • Proven to work in 150% of working pressure
  • Simplistic and workable
  • Available with threaded or weld-on type sub
  • Easy to repair in the field with available seal kits, recharge kits, and diaphragms


Specify Your Order:

  • Working pressure
  • Connection type
  • Type of union and sub needed
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