■ Overview

The pneumatic piston cut-off valve consists of a pneumatic multi-spring piston actuator and a cut-off valve with a low-flow-resistance, double-sealing structure, which is first introduced domestically. The actuator has the characteristics of fast action speed, large thrust, self-resetting function, and is equipped with a manual operating mechanism. The valve body has a smooth flow path, a large flow coefficient. The valve core and seat have elastic and rigid double-level double seals. The novel and unique structure makes this product a high-performance new type of cut-off valve with fast action, strict cut-off, safety and reliability.

This product has excellent performance, complete specifications, as well as advantages such as small size and light weight. It can meet the operational requirements of automatic rapid discharge and emergency cut-off in chemical, petroleum, metallurgical and other industrial departments during production processes. It is suitable for the safety protection systems of production processes and equipment, and is also applicable to general two-position control and switch operation occasions.

■ Specifications and Technical Parameters

Parameter Specification
Nominal Pressure (MPa) 1.6, 6.4
Nominal Diameter (mm) 25, 40, 50, 65, 80, 100, 150, 200
Rated Flow Coefficient Kv 10, 25, 40, 63, 100, 160, 400, 630
Rated Stroke (mm) 10, 16, 30, 60
Effective Area of Cylinder (cm²) 180, 360, 700, 1400
Full Stroke Time (s) ≤1, ≤1.5, ≤2
Allowable Pressure Difference (MPa) 6.4, 4.8, 3.1, 2.7, 1.6
Leakage Amount Hard seal: 1×10⁻⁷ of the rated capacity; Soft seal: Class VI (GB/T4213)
Operating Pressure (KPa) 500
Working Temperature (°C) -40~+250, -40~+450, -40~+180 (for soft seal)
Ambient Temperature (°C) -40~+70

■ Materials of Main Parts

Part Name Material
Valve Body, Bonnet ZG230 - 450, ZG1Cr18Ni9, ZG0Cr18Ni12Mo2Ti
Valve Core, Valve Seat 1Cr18Ni9, 0Cr18Ni12Mo2Ti, hardfacing with Stellite alloy on sealing surface
Valve Seat Ring 0Cr18Ni12Mo2Ti, Polytetrafluoroethylene (PTFE)
Packing Polytetrafluoroethylene, Flexible Graphite
ZMX气动三通切断阀 翻译
ZMX Pneumatic Three-Way Cut-Off Valve

其中，"ZMX" 作为型号保留；"气动" 译为 "Pneumatic"；"三通" 对应 "Three-Way"，体现阀门的通路结构；"切断阀" 译为 "Cut-Off Valve"，准确表达其截断流体的功能。该译法符合工业阀门领域的专业表述习惯，适用于技术文档、设备标识等场景。
翻译
The ZMX Pneumatic Three-Way Cut-Off Valve adopts a top-guided structure and is equipped with a multi-spring actuator. It features a compact structure, light weight, sensitive action, an S-streamlined fluid channel, small pressure drop loss, large valve capacity, convenient assembly and disassembly, etc. The cut-off valve receives signals from the regulating instrument to cut off, open or change the medium flow direction, so as to achieve automatic control of process parameters such as pressure, flow, temperature or liquid level. It is widely applied in the production process automatic control and remote control systems of various industrial sectors such as petroleum, chemical industry, metallurgy, electric power, light industry, and textile.

This series of products has single-seat, sleeve, and double-seat (two-position three-way) valve body structures, and two sealing forms: packing seal and bellows seal. There are four nominal pressure ratings: PN10, 16, 40, and 64, and the nominal diameter range is DN20 - 200mm. The applicable fluid temperature ranges from -60°C to 450°C. The leakage grade is Class IV or Class VI. The flow characteristic is quick opening.

Materials of Main Parts

  • Valve body, sealing sleeve: HT200, ZG230 - 450, ZG1Cr18Ni9Ti, ZGOCr18Ni12Mo2Ti
  • Valve core, valve seat: 1Cr18Ni9Ti, OC r18Ni12Mo2Ti, 1Cr18Ni9Ti with Stellite alloy hardfacing
  • Sleeve, valve plug: 1Cr18Ni9Ti, OC r18Ni12Mo2Ti, 1Cr18Ni9Ti with Stellite alloy hardfacing
  • Packing: Polytetrafluoroethylene, flexible graphite
  • Bellows film: Butadiene rubber sandwiched with reinforced nylon fabric
  • Spring: 60Si2Mn
  • Valve stem, 推杆 (actuating rod): 1Cr18Ni9Ti
  • Gasket, valve seat (soft part): Reinforced polytetrafluoroethylene
  • Bellows: 1Cr18Ni9Ti