Back Pressure Reducing/Bypass

The Mark 50 Sliding Gate Back Pressure Regulator is used to regulate upstream pressure at a predetermined setpoint.
Self-Operated Back Pressure Regulator - Mark 50 Series
The Mark 52 internally piloted, back-pressure regulator is a specialty valve designed for critical application regulation in locations where space is limited.
Internally Piloted Regulator - Mark 52 Series
The Mark 53 maintains a constant differential between the inlet pressure and the pressure loaded on top of the diaphragm. It can be used for both differential and remotely adjusted applications.
Differential Back Pressure Regulator - Mark 53/54 Series
The Mark 55 regulator controls accurately and shutoff tightly to maintain the proper vacuum setting.
Vacuum Regulators - Mark 55 Series
The Mark 56 is a highly accurate and economical air loaded back-pressure regulator that provides regulation from a local or remote station. The operation of the Mark 56 requires no control spring or pilot.
Air Loaded Back Pressure Regulator - Mark 56 Series
The Mark 57 provides accuracy approaching that of controller-operated valves and should be considered on most critical applications before other more expensive and sophisticated instrumentation.
Externally Piloted Regulator - Mark 57 Series
The Mark 58 back pressure regulator features three ports: a bypass outlet on the bottom and two side ports which are directly connected to serve as dual inlets or as inlet and outlet for flow-through.
Globe Style Back Pressure Regulator - Mark 58 Series
The Mark 508 Gas Back Pressure Regulator is the ideal valve for low-pressure gas regulation. The Mark 508 works in conjugation with the Mark 608 in a low-pressure tank blanketing valve system.
Tank Blanketing Valve - Mark 508 Series
The Mark 518 is a back-pressure regulator for use in low pressure air and gas services. With a selection of six pressure ranges, set points can be chosen to control back-pressures.
Double Seated Tank Blanketing Valve - Mark 518 Series
The Mark 5108 Series maintains the line pressure within a relatively narrow limit.
Back pressure regulator - Mark 5108 Series