美国posi flate蝶阀现货销售 Less friction, low torque, less wear, longer life.Posi-flate's unique butterfly valve design uses air pressure to expand the seat against the disc, providing even pressure distribution for a bubble-tight seal, every time. Because the seat makes only casual contact with the disc during valve opening and closing, there is minimal disc impingement. This is in contrast to conventional butterfly valves where disc impingement leads to shaving of the seat, decreasing the overall performance and valve life. Substantially less torque is required to open and close the Posi-flate butterfly valve, thus a smaller actuator can be used resulting in lower overall valve cost. In actual comparison tests and documented field applications, the Posi-flate butterfly valve outperformed all other valves. In fact, a Posi-flate valve life of one to three million cycles,even in extremely abrasive applications, is not uncommon. For dry solids, gases and slurryapplications, the Posi-flate inflatable seated butterfly valve is unsurpassed. The Posi-flate Series 585/586 inflatable seated butterfly valves are designed for the most severe conditions. The seat is designed for heavy duty applications and higher operating pressures. Standard valve sizes range from 2" (50mm) to 24" (600mm) and fit both ANSI and metric flanges. A full line of actuators, limit switches and controls are available to suit individual applications. 美国posi flate蝶阀现货销售
TORK-MATE™
Pneumatic Actuators
890 Series
|  | Heavy Duty
Rack and Pinion
Extended Life...
Up to 15 Million Cycles
|
Advantages  | The Tork-Mate 890 series extended life actuators are ideal for the operation of 90° turn devices such as butterfly valves, ball valves, plug valves, damper valves and other devices. Tork-Mate pneumatic actuators have features that are unique, providing many benefits to the user looking for worry-free service.  TMHC 2324
A proprietary two-step hardcoat process that offers superior protecion on interior and exterior housing surfaces. TMHC 2324 also ensures maximum life from the piston seals, piston bearings and heel bearings. NAMUR Mounting Tork-Mate 890 series actuators meet the latest NAMUR standards, allowing direct or close coupling of NAMUR designed accessories. The pinion interface features a positive, international standard drive for positioners, switches and other accessories. The solenoid interface allows direct acceptance of any NAMUR designed control valves. Modular Easily removable end caps and modular spring packs simplify the conversion from double-acting to spring-return configurations. | | Travel Adjustment The Tork-Mate 890 series actuators feature pinion travel stops that allow a full +/-10° of valve travel adjustment. As an option, extended stroke adjustment screws can be added for inexpensive throttling applications. Extended Cycle Life Special piston seals provide greatly extended life compared to standard O-ring actuators. All other bearings, seals and components have been engineered to provide superior and extended service lives. Blow-out Proof Pinion Gear In addition to the stainless steel pinion retaining ring, the Tork-Mate 890 series actuators feature a unique internal safety bar. Operating Ranges Tork-Mate 890 series double-acting actuators produce guaranteed minimum torque outputs up to 17,466 inch pounds (1973 Nm). Custom Options These include Viton® seals, high temperature trim up to 250° F (121° C), special finishes, stainless steel pinions, special mounting configurations and special coupling configurations. Imperial or Metric Mounting | Operation Principles | | Double-Acting For clockwise operation, Port 2 (P2) is open to atmosphere and air pressure is directed to Port 1 (P1). As the pistons move apart, the pinion rotates clockwise. The linear movement of the pistons is converted to rotary  motion by the piston racks and the output pinion gear. For counter-clockwise operation, Port 1 is open to atmosphere and air pressure is directed to Port 2. The pressure differential moves the pistons together, rotating the pinion counterclockwise. | | Spring Return For clockwise operation, Port 2 is open to atmosphere and air pressure is directed to Port 1. The air pressure compresses the springs and moves the pistons outward. As the pistons move apart, the pinion rotates clockwise.  The linear movement of the pistons is converted to rotary motion by the piston racks and the output pinion gear. For counter-clockwise operation, Port 1 is open to atmosphere and air pressure is directed to Port 2. High pressure and/or spring force moves the pistons inward, rotating the pinion counterclockwise. |
Design Features 
Accessories
Specifications 美国posi flate蝶阀现货销售 |
