Piloted, Liquid Pressure Regulating Valves The Mark 6127 pressure-reducing valve is used in many applications worldwide. The primary function of the Mark 6127 is to reduce a greater upstream pressure to a lesser, more manageable downstream pressure, and operate without regard to either upstream supply or downstream demand. The liquid pressure regulator valve is easily maintained without removal from the line.

Differential Pressure Regulators; Sliding Gate Seat; 1/4″ – 2″ (DN8 – DN50); The Mark 63 - differential pressure regulator is designed to maintain a constant differential between the pressure on the discharge side of the regulator and the signal pressure loaded on the diaphragm. The Mark 64 provides the same flow capacity but with less offset in controlled pressure due to a larger diaphragm. This differential pressure regulator valve series is ideal in fuel oil atomization applications. A negative differential version is also available.

Differential, Jorlon Diaphragm The Mark 53 and 54 Series transform challenging differential pressure control into reliable, repeatable operation. By maintaining a precise pressure differential between inlet and signal pressure, these valves enable sophisticated process control strategies – from maintaining consistent pressure drops across filters and strainers to managing complex reactor pressure profiles. When your process depends on maintaining exact pressure relationships, not just absolute pressures, these differential pressure valves deliver the control intelligence you need.

Self-Operated Sliding Gate Back Pressure Regulator; Quick Ship Available 1/4" - 4", up to 200 Cv The Mark 50 Series self operated back pressure regulator is built for versatility, handling steam, water, oil, gas, air, and chemicals with ease. Featuring a high-capacity sliding gate trim, it delivers precise, rapid pressure regulation to prevent dangerous over-pressures across a wide range of applications. Sizing: 1/4″ – 4″ (DN8 – DN100) Cv (Kv): up to 200 (up to 172) Need it fast? We offer quick ship options to get your system running without delay.

High Flow Back Pressure Regulator; Sliding Gate; 1-1/2″ – 2″ (DN40 – DN50) Higher Steam Flow Without Upsizing – Cut Costs, Boost Efficiency, and Reduce Maintenance When your steam application demands higher flow capacity, but jumping to a larger line size isn’t in the budget-or the plant layout-you need a smarter solution. The Mark 501 and Mark 502 Series high flow back pressure regulators deliver high and ultra-high flow performance without the added cost, space, and complexity of upsizing. The Mark 501 handles flows up to Cv 50 (Kv 43), and the Mark 502 pushes that even further to Cv 70 (Kv 60)—giving you more throughput, more efficiency, and more control with the same line size. And thanks to precision-engineered sliding gate seats, these high flow back pressure regulators fight the internal build-up that often plagues high-flow steam systems. That means fewer shutdowns, less maintenance, and more uptime—so your operation keeps running hot, clean, and efficient.

High Pressure Back Pressure Regulator; Up to 450 psi (31 bar); 1/4" - 4" (DN8 - DN100) The Mark 50HP Series high pressure back pressure regulator delivers precise upstream pressure control up to 450 psi, giving you the capability to manage challenging process conditions without compromising safety or performance. The robust large spring design ensures consistent setpoint control even in fluctuating high-pressure environments, protecting upstream equipment from damaging pressure surges that could lead to catastrophic failures or unplanned shutdowns.

Large diaphragm, 1/4" - 3/4" size range The Mark 51 Series high temperature back pressure regulator delivers reliable back pressure regulation across your entire facility's fluid systems – from high-temperature steam lines to corrosive chemical processes. Whether you're managing water utilities, oil circulation systems, compressed air networks, or specialty gas applications, one valve design handles them all. This versatility means simplified spare parts inventory, consistent maintenance procedures across different services, and reduced training requirements for your team.

Internally Piloted Back Pressure Regulator Solve Your Toughest Space Challenges Without Compromising Performance The Mark 52 delivers full pilot-operated precision in installations where traditional piloted systems simply won't fit. Whether you're retrofitting crowded piping galleries, designing compact skid systems, or working within the confined spaces of offshore platforms, this pilot operated back pressure regulator provides the sophisticated control you need without the typical bulk. Its small footprint and lightweight construction reduce structural support requirements and simplify installation in areas with limited access.

Upstream Vacuum, Jorlon Diaphragm The Mark 55 Series vacuum back pressure regulator delivers the precise vacuum control essential for sensitive processes where even minor fluctuations can ruin product batches or damage equipment. Whether you're managing evaporator efficiency, ensuring consistent product quality in vacuum cookers, maintaining precise conditions in altitude testing chambers, or protecting delicate dairy operations, this vacuum back pressure valve maintains your exact vacuum setpoint with tight shutoff that prevents vacuum loss during idle periods. Your processes run at optimal efficiency while eliminating the energy waste and equipment wear caused by vacuum instability.

Dome Loaded, High Accuracy The Mark 56/560 Series dome loaded back pressure regulator revolutionizes back pressure control by eliminating mechanical springs in favor of precise air loading. This means you can adjust setpoints on-the-fly to match changing process conditions – no more manual spring changes, no more compromise setpoints, no more shutdowns for pressure adjustments. Whether optimizing batch processes, responding to seasonal demand changes, or fine-tuning system performance, you now have complete control at your fingertips. Configure control exactly how your operation needs it. Couple with an I/P transducer for seamless integration with your DCS or PLC, enabling remote setpoint changes and automated pressure profiles. For local control, pair with a Mark 12 loading station or LowFlow JR regulator for precise manual adjustment. This flexibility of this dome loaded back pressure regulator means operators can optimize pressure from the control room during normal operation, while maintenance staff retain local control capability for commissioning and troubleshooting.

Pilot-Operated, Superior Accuracy The Mark 57 Series pilot operated back pressure regulator is designed to accurately control pressure to 90% of its rated flow capacity with only a small deviation from setpoint, providing accuracy that approaches that of controller-operated valves and should be considered on most critical applications. This versatile pilot operated back pressure regulator valve features Jordan Valve's proprietary sliding gate seat technology, which provides straight-through flow for reduced turbulence, quiet operation, fast response, and tight shutoff. Available in sizes ranging from 1/2" to 6" (DN15 to DN150) with Cv values up to 395 (Kv up to 340), the Mark 57 can handle a wide variety of applications including steam, air, gas, liquids, and chemicals. The pilot operated back pressure regulator features a stainless steel diaphragm and offers setpoint ranges from 10 to 185 psi (0.7 to 12.8 bar), with high turn-down ratios up to 50:1. Body materials include ductile iron, carbon steel, stainless steel, and cast iron, with various end connection options including threaded, flanged, socket weld, and butt weld configurations. The Mark 57 carries both EC Declaration of Conformity/PED certification for sizes 1-1/4" to 6" and CRN (Canadian Registration Number) approval for the full size range from 1/2" to 6".

Wafer Style, Jorlon Diaphragm The Mark 575 Series wafer style sliding gate back pressure regulator is designed to regulate upstream pressure to a predetermined setpoint, utilizing a spring-loaded mechanism that holds the sliding gate seats in their normally closed position. This innovative wafer-style design significantly reduces weight compared to traditional flanged valves while providing exceptional performance through Jordan Valve's sliding gate technology. This spring loaded back pressure valve is available in sizes from 3" to 6" (DN80 to DN150) with flow capacities up to 400 Cv (345 Kv), the Mark 575 delivers accurate pressure control across setpoint ranges from 4 to 30 psi (0.28 to 2.07 bar). The spring loaded back pressure valve features the highly durable Jorlon diaphragm, tested to over 1,000,000 full stroke cycles without failure, and optional Jorcote ceramic seat coating that maintains Class IV shutoff even after extensive use in demanding steam applications up to 550°F (288°C). Its straight-through flow design operates 5-10 dB quieter than conventional globe-style regulators while providing superior rangeability up to 20:1. The self-contained design requires no external sensing lines, and the sliding gate seats can be easily removed without special tools, making the Mark 575 an ideal choice for applications requiring reliable back pressure control with minimal maintenance requirements across steam, gas, and liquid services.

Cage Trim, Dual Inlet & Outlet for Through-Flow The Mark 58FT/A features three ports: a bypass outlet on the bottom and two side ports which are directly connected to serve as dual inlet and outlet for through-flow. The Mark 58FT is designed to be installed in a "T" fashion such that the fluid normally flows in one side and out the other side; whereas the Mark 58A is designed to be installed with one side port as an inlet and the other side port plugged with the flow being relieved through the bottom bypass.

Globe Style, Back Pressure Regulating Valve The Mark 58G is available in sizes up to 2" (DN50) in carbon steel or stainless steel. Diaphragms can be either Jorlon, Stainless Steel or Elastomer. Low flow versions with Cv values as low as 0.26 are available in certain sizes.

Dome Loaded Mark 586FT installation – designed to be installed in a "T" fashion such that the fluid normally flows in one side and out the other side, with the flow being relieved through the bottom bypass when the pressure exceeds the setting. Mark 586A installation – designed to be installed with one side port as an inlet and the other side port plugged with the flow being relieved through the bottom bypass when the pressure exceeds the setting.