Pneumatic piston cut-off valve
Working principle of pneumatic piston cut-off valve
When the signal pressure is zero, the valve core is in its initial state (normally open or normally closed) due to the preload force of the spring (single acting only). When the actuator receives a signal pressure (0.4~0.6MPa), the compression spring drives the push rod, valve body, and valve core to move to the limited position, making the valve fully open or fully closed. To achieve control over the connection, disconnection, or switching between pipelines for the medium inside the pipeline. Equipped with a two position three-way electric sample valve, the piston type cut-off valve control is more convenient and simple.
Structural principle of pneumatic piston cut-off valve
The pneumatic piston cut-off valve consists of two parts: a pneumatic piston actuator and a straight stroke adjustment mechanism, which are connected by a bracket edge in the middle. According to the form of the regulating mechanism, pneumatic piston cut-off valves can be divided into three types: straight through single seat cut-off valves (ZSQP type), straight through sleeve cut-off valves (ZSQM type), and two position three-way cut-off valves (ZSQN type). There are two types of pneumatic piston actuators: single acting (spring reset) and double acting (double intake). Adopting a single acting actuator, the overall operation mode of the machine can be divided into air closed (horizontal pipeline connection) and air open (horizontal pipeline disconnection). Pneumatic piston cut-off valves have two sealing forms: hard seal and soft seal, which are suitable for different temperatures and pressures. The ZSQM pneumatic piston sleeve cut-off valve adopts a balanced valve core, which can increase the cut-off pressure difference. The two position three-way cut-off valve adopts a four-way valve body with three flow ports, which is particularly suitable for switching between two flow paths.
Main component materials
| ZSQ活塞式氣動切斷閥閥體、閥蓋 | ZSQ活塞式切斷閥閥芯 | ZSQ氣動切斷閥閥座 | 氣缸體 | 活塞 | 填料 | 閥芯軟質(zhì)密封件 |
| HT200、ZG230-450、 ZG1Cr18Ni9Ti、ZGOCr18Ni12Mo2Ti | 1Cr18Ni9Ti、 Cr18Ni12Mo2Ti | 1Cr18Ni9Ti、 Cr18Ni12Mo2Ti | ZG230-450 | ZAlSi12 | 聚四氟乙烯，柔性石墨 | 增強聚四氟乙烯 |
氣動活塞切斷閥主要技術(shù)參數(shù)
| ZSQ型氣動切斷閥公稱通徑 DN （ mm ） | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | ||
| 額定流量系數(shù)（ KV ） | 7 | 11 | 20 | 30 | 48 | 75 | 120 | 190 | ||
| 額定行程（ mm ） | 8 | 12 | 20 | 25 | ||||||
| 氣缸直徑（ mm ） | 75 | 100 | 150 | |||||||
| 允許泄 >漏 量 | 硬密封（ l/h ） |
單座、三通： 1.2 × 10 -7 ×閥額定容量 套筒： 5 × 10 -6 ×閥額定容量 |
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| 軟密封 | VI 級 | |||||||||
| 工作溫度（） | -20~200 -40~450 | |||||||||
| 公稱壓力 PN （ MPa ） | 1.6 4.0 6.4 | |||||||||
| 允許壓差 >（ MPa ） | ZSQP | 單作用 | 1.16 | 0.66 | 0.39 | 0.6 | 0.39 | 0.4 | 0.31 | 0.20 |
| 雙作用 | 6.4 | 5.0 | 2.8 | 3.3 | 2.13 | 2.71 | 1.75 | 1.11 | ||
| ZSQM | 單作用 | 公稱壓力 | ||||||||
| 雙作用 | ||||||||||
| ZSQN | 單作用 | 0.89 | 0.57 | 0.35 | 0.56 | 0.36 | 0.45 | 0.30 | 0.20 | |
| 雙作用 | 5.2 | 3.22 | 2.03 | 2.27 | 1.46 | 2.00 | 1.32 | 0.85 | ||
| 信號壓力（ KPa ） | 0 或 400~600 | |||||||||
