Piloted Industrial Back Pressure Regulator, Sizes: 1-1/4″ – 24″ In many liquid piping systems, it is vital that line pressure is maintained within relatively narrow limits. Installed in the main flow line, the standard Mark 5108-2 acts as a back pressure or pressure sustaining valve. In this configuration, the back pressure sustaining valve maintains a constant upstream pressure regardless of fluctuating downstream demand. When used in a bypass line, the same model will function as a relief valve.

Direct Operated Tank De-pad Regulator or Gas Back Pressure Regulator for low pressures 3/4″ – 2″ (DN20 – DN50) The Mark 508 Series gas back pressure regulator is the ideal valve for low back pressure gas services. The Mark 508 works in conjunction with the Mark 608, in a low pressure tank blanketing valve system. The Mark 508 can be used to vent gas from the tank to prevent the blanketing pressure from rising to a level that could damage the tank while maintaining a small constant flow to keep the blanket fresh. It will also work well in any other type of low back pressure application.

Direct Operated Tank De-pad Regulator or Gas Back Pressure Regulator for low pressures 1", 2", 4" (DN25, DN50, DN100) 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 from 1" w.c. to 7 psi (3mbar to 0,5 bar). As a standard feature, the MK518 is provided with soft seals for ANSI Class VI shutoff. The valve is also leak-proof under vacuum conditions. The Mark 518 back-pressure relief valve is used for maintaining the pressure of air and gases in the positive inches w.c. (mbar) pressure range.

Direct Operated Tank Padding Regulator or Gas Pressure Reducing Regulator for Low Pressures 1-1/2" - 2" (DN40 - DN50) The Mark 608 gas pressure regulator is used on large tank blanketing applications or other low pressure gas regulation. In a tank blanketing application, the Mark 608 is used to control the flow of the blanketing gas into the tank to maintain the proper positive pressure. Once the blanket has been established, a small flow of nitrogen is continually admitted to the tank to keep the blanket fresh.

Direct Operated Tank Padding Regulator or Gas Pressure Reducing Regulator for Low Pressures 3/4" - 1" (DN20 - DN25); Balanced Plug - Good for High Inlet Pressures The Mark 608BP balanced plug gas pressure regulator is the ideal valve for low pressure gas regulation with higher inlet pressures. The self-contained low pressure gas regulator is for use on tank blanketing, gas meter inlet pressure regulating and other low pressure air and gas applications. The valve can be installed in any position and can be easily repositioned in-line.

Direct Operated Tank Padding Regulator or Gas Pressure Reducing Regulator for Low Pressure 3/4" - 1-1/4" (DN20 - DN32); Internal Sensing - Good for Low Inlet Pressure The Mark 608IS gas pressure regulator is the ideal valve for low pressure gas regulation. The self-contained low pressure gas regulator is for use on tank blanketing, gas meter inlet pressure regulating, gas burners and other low pressure air and gas applications. The valve can be installed in any position and can be easily repositioned in-line.

Piloted Tank Padding Regulator or Gas Pressure Reducing Regulator for Low Pressures 1" - 2" (DN25 - DN50) The Mark 688 Series piloted soft seat regulator is designed specifically to provide accurate pressure control on very low pressure tank blanketing systems. The pilot operated Mark 688 responds to very small changes in tank pressure by throttling open or closed to maintain the desired pressure set point.

Piloted Tank Padding Regulator 3/4", 1" (DN20, DN25); External Pilot The Mark 695 Series piloted soft seat regulator is designed specifically to provide accurate pressure control on very low pressure tank blanketing systems. The pilot operated Mark 695 responds to very small changes in tank pressure by throttling open or closed to maintain the desired pressure set point.

Piloted Tank Padding Regulator 2" (DN50); Internal Pilot The 2" Mark 695 is an internally piloted tank blanketing regulator. Pre-formed Jorlon is used for the diaphragm for maximum sensitivity to minute pressure changes inside the tank. Optional features include: inline or angle bodies, purge system and outlet gauges.

Direct Operated Tank Padding Regulator 1/2" - 3/4" (DN15 - DN20) The Mark 695X Series regulator is designed specifically to provide accurate pressure control on very low pressure tank blanketing systems. The Mark 695X responds to very small changes in tank pressure by throttling open or closed to maintain the desired pressure set point. It has an ultralight diaphragm for maximum sensitivity.

Self-Operated, No External Power Source The Mark 80 Series is completely self-operated and requires no external power source or other expensive instrumentation to operate the valve. Depending on valve action, the seats open or close as bulb senses rise in temperature. The Mark 80 has high rangeability - controls flows from 10% to 90% of rated capacity. Available with up to 100 feet (30 meters) in capillaries.

Self-Operated, High Flow The Mark 801/802 Series is completely self-operated and requires no external power source or other expensive instrumentation to operate the valve. The Mark 801/802 Series are high-flow versions of our Mark 80 Series temperature regulators. Available with up to 100 feet (30 meters) in capillaries.

Internal Piloted Temperature Regulators

Controlled Failure Option The Mark 85 Series is a self-operated temperature regulator with controlled failure option which allows you to predetermine the position of the valve in the event of a thermal system failure. The Mark 85 is designed to fail closed on heating applications and to fail open on cooling applications. The Mark 85 Series is ideal for slower responding systems such as autoclaves and large storage tanks.

Ambient Temperature The Mark 86 regulator is designed to control steam tracing lines based on ambient temperatures. The MK86 allows steam to flow through the tracer lines only when it is needed, then opens or closes when ambient temperature rises above or below the setpoint depending on action.