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The Mark 8000 Series is a group of heavy-duty control valves specifically designed for process applications requiring full flow or fractional flow control. Available in a wide selection of body sizes and styles, this valve can be configured in two-way or three-way designs, for diverting or mixing service, and with globe or angle valve style seats. It can be ordered with a bellows stem seal, or an extended bonnet extension for cryogenic applications down to -425°F (-254°C), or with an electric actuator. It has a totally enclosed multi-spring actuator, which minimizes deadband and is field reversible without the use of special tools or extra parts. LowFlow Valve can also install a wide variety of positioners and actuators on the Mark 8000 to provide a valve that meets specific requirements. The Mark 8000 Series valve subassembly is manufactured completely from barstock, which combined with the standard heavy duty yoke and actuator, gives the valve the ability to handle pressure up to 6000 psi (414 bar), while still being able to offer Cv’s ranging from 0.05 – 17 (Kv’s 0,04 to 14.6). The barstock body design also allows greater flexibility when specialty materials are required. While the standard body materials are Stainless Steel and Carbon Steel, the Series 8000 can be manufactured in almost any exotic alloy, including Alloy 20, Hastelloy, Inconel and Monel. The Mark 8000 body material is not limited to alloys. I can also be manufactured in PVC or Kynar for applications where thermoplastics offer a better solution over alloy materials.
Minimum Data Requirements to Size Valve
The 8000 Series the bellow stem seals eliminates fugitive emissions by surrounding the valve with a pressure-tight barrier, isolating the stem from the process fluid and preventing leakage to the atmosphere. For an extra measure of protection, the bellows stem seal option provides a back-up seal of Teflon, braided or Graphite/Grafoil packing.
The cryogenic option offers a bonnet extension that provides protection for the packing and actuator by preventing the formation and build-up of ice, which can interfere with movement of the valve stem and affect valve performance and control. This model is for use on cryogenic services with temperatures as low as -425°F (-254°C). The Mark 8000 Series is heavy-duty pneumatic control valve developed for cryogenic services. It is recommended for use with process below -40°F (-40°C).
Minimum Data Requirements to Size Valve
The three-way Mark 8000T can be specified for use on mixing or diverting services. As a mixing valve, it is designed with two inlets to blend two separate flow streams into a common outlet creating a third fluid. For diverting service, the valve features on inlet and two outlets, allowing you to divert the flow from one outlet to the other as required to bypass heat exchangers, coolers, filters or other pieces of process equipment. The Mark 8000T is a heavy-duty pneumatic control valve developed for standard or low flow industrial process applications. It is recommended for use when service or environmental conditions may be too harsh for traditional three-way control valves.
Minimum Data Requirements to Size Valve
J Series Filters utilize a pleated, 10 micron filter in 304 Stainless Steel for maximum contaminant control. Cleanable and replaceable elements provide long life and reduced operating costs.
The JBDL Series is a diaphragm operated, balanced trim, back pressure regulator. The 1.95 Cv offers increased flow across its 1200 psi inlet range, while the Kel-F soft seat provides ANSI Class VI shutoff. Four set spring ranges and three soft seal options offer the customer flexibility in a number of applications and environments. These valves are designed to regulate a variety of gases and liquids from pump and compressor control to process pressure control where high flows and low pressures are required.
The JBPH Series is a piston operated back pressure regulator. The 0.5 Cv offers increased flows across its 6000 psi inlet range, while the Kel-F soft seat provides ANSI Class VI shutoff. Four set spring ranges and three soft seal options offer flexibility in a number of applications and environments. These valves are designed to regulate a variety of gases and liquids from pump and compressor control to process pressure control where high flows and high pressures are required.
The JRHF Series is a diaphragm operated, balanced trim pressure regulator. The choice between 1.5 and 1.9 Cv offers increased flows across the JRHF’s 230 psi inlet range, while the PTFE soft seat provides ANSI Class VI shutoff. Four set spring ranges and three soft seal options offer the customer flexibility in a number of applications and environments. These valves are designed to regulate a variety of gases and liquids in applications where high flows and low control pressures are required.
The 1/4″ JRPH/JRPL Series are piston operated, balanced trim pressure regulators with high pressure capability and PEEK or KEL-F soft seat for ANSI Class VI shutoff. There are four set ranges for this model. Elastomer seals are used throughout with Buna-N, EPDM, and Viton being standard options. These valves are designed to regulate a variety of general, corrosive and specialty gases, water, acids and oils.
The hydraulic, high pressure JRPHH Series pressure reducing regulators are piston sensed and designed for inlet and outlet pressures up to 10,000 psig (689 bar). JRPHH Series regulators feature a wide range of inlet and outlet configurations, Cv: 0.06 or 0.2, adjustable captured venting and compatibility with a broad range of media.
The JRPL Series and JRPH Series are piston operated, balanced trim pressure regulators with high Cv’s and Kel-F soft seat for ANSI Class VI shutoff. There are three set ranges for each model. Elastomer seals are used throughout with Buna-N, EPDM and Viton being standard options, along with PTFE split ring back up seals. These valves are designed to regulate a variety of gases, water, acids and oils.
The Mark 5800HP is a high pressure, back pressure regulator designed to maintain upstream pressure of gases and liquids. As a compact, lightweight product, it is well suited for applications where space and weight are at a premium. With a robust, piston design, the Mark 5800HP can handle setpoints up to 2500 psig (172 bar) at 450°F (232°C) with ease and large flow capacity for a valve of this style is among the highest in the industry. The T-bar adjusting handle allows for a lighter spring and more sensitive regulator than those models with a fixed knob.
The Mark 5850HP is a high pressure, back pressure regulator designed to maintain upstream pressure of gases and liquids. As a compact, lightweight product, it is well suited for applications where space and weight are at a premium.
With a robust piston design, the Mark 5850HP can handle setpoints up to 5000 psig (345 bar) at 100°F (37,8°C) with ease. The T-bar adjusting handle allows convenient, precise final setpoint adjustment.
The Mark 6800HP is a self-operated pressure regulating valve for use on high pressure industrial gas and liquid services to 4000 psi (276 bar). The Mark 6800HP features exceptional accuracy with high flow capacities and simple in-line maintainability.
The Mark 708 with bellows stem seals that eliminate fugitive emissions by surrounding the valve stem with a pressure-tight barrier, isolating the stem from the process fluid and preventing leakage to the atmosphere.