Showing 1–15 of 21 results
The Mark 128PQC Series Control Valve body assembly is suitable for on-off dump valve service in oil and gas production applications, in either sweet or sour gas conditions. This valve is also useful for on-off high-pressure control of numerous gasses and liquids, and can be used with materials that are viscous or erosive.
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. During filling, the Mark 508 opens to allow gas to escape as the vapor space in the tank grows smaller.
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.
The 1-1/2″ and 2″ size Mark 608 valves are suitable for large tank blanketing applications and 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.
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, gas burners and other low-pressure air and gas applications. The valve has a 360° orientation, can be installed in any position, and can be easily repositioned while in line. The seat and plug can be inspected without removing body from the line.
The Mark 608DS is a double-seated, self-operated gas regulator for use in tank blanketing applications.
The double-seated design allows the Mark 608DS to handle increased flow and higher pressure drops than similarly sized single-seat valve types while maintaining ANSI Class VI shutoff. The large diaphragm is highly sensitive and insures accurate regulation. All wetted metal parts are produced from CF3M 316L Stainless Steel or WCB Carbon Steel for durability and longevity.
The Mark 608IS gas pressure regulator is ideal 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 Mark 608IS is normally open. The aspirator senses increases in the outlet pressure, causing the large elastomer diaphragm to rise, moving the plug toward the seat. As outlet pressure decreases, the diaphragm shifts down and moves the plug away from the seat to increase flow. The lever, which connects the stem to the diaphragm, amplifies diaphragm forces for tighter shutoff.
The Mark 627 is a self-operated, pressure-reducing regulator that provides accurate regulation and tight shutoff on low- or high-pressure systems. Use on air, natural gas, or a variety of other gases.
The Mark 627 handles inlet pressures up to 2000 psi (137,9 bar). It features a tamper-resistant protective cap and the top entry design allow easy in-line maintenance. The standard 316 stainless steel orifice comes in six different sizes. The carbon steel body has FNPT end connections and is available in 3/4″ (DN20) and 1″ (DN25).
The Mark 630 is a self-operated, pressure-reducing regulator that provides accurate regulation and tight shutoff on high-pressure gas systems. It handles inlet pressures up to 1500 psi (103,4 bar) for a variety of gases.
The rugged design is available in 1″ (WCB body) and 2″ (Ductile Iron body) and offers brass or stainless trim.
The Mark 686 is a cage trim pressure-reducing valve that features air-loading, high capacities, accurate regulation, and easy servicing; making it an exceptional choice for pressure regulating applications. Bottom-entry cage trim for simple cleaning or repair allows all working trim parts to be removed from the body as one assembly. The diaphragm is easily accessible from the top, allowing maintenance without removing the valve from the line.
The main valve of the Mark 687 is normally closed. The upstream pressure (PI) enters the main valve body and passes through the piping to the pilot valve. The pilot valve is normally open, allowing the upstream pressure to move through the outlet port of the pilot valve to act on the bottom of the main valve diaphragm. This force pushes the stem upward, opening the main valve.
As the downstream pressure rises to the setpoint, the pilot senses the rising pressure and begins to close. This throttles the flow to the main diaphragm. This pressure on the main valve diaphragm is bled off downstream and the main valve closes. In this way, the Mark 687 modulates between open and closed to maintain control.
The Mark 68HP is designed primarily for high pressure steam service commonly found in power plants, refineries, pulp and paper mills, and other high pressure process applications. Since high pressure superheated steam is routinely used for power generation (turbines), a pressure regulator capable of withstanding these pressures is needed for the distribution of lower pressure steam for individual process requirements.
Common uses for the Mark 68HP include:
– Pressure reduction of turbine extraction steam to desuperheaters.
– Steam injection to turbine bearing seals to eliminate pressure differential across this area.
– Primary pressure reduction from the main steam header to lower pressure points of use.
The Mark D & DA Series are single port, screwed-in metal-seated valves with unbalanced post-guided valve plugs, and push-down-to-close plug action used for high pressure applications. These valves are used in the oil and gas industry, and are especially useful for throttling or on/off control of liquids or gases, providing excellent pressure and flow control of gasses and various liquid processes.
The Mark DBAQ Series control valves are ideally suited for high pressure water and steam applications, providing excellent pressure and flow control. This design may be utilized in both high pressure and high temperature control service.
The Mark DBAQ is an angle style valve, which may be used in angle piping or self draining applications. The Mark DBAQ Series valves are single port, metal seated valves.