| 说明
Description
气动A型夹管阀是由美国红阀公司创新研制并拥有专利，气动A型夹管阀为流量控制难题提供成本低廉的、独特的解决方案。在全世界，实际应用的夹管阀中，美国红阀公司的A型夹管阀比其他所有夹管阀还要多。秘密就在于阀门内唯一与流体接触的部件 --橡胶套管上。
Introduced and patented by Red Valve, the air -actuated Type A Pinch
Valve offers a unique, cost-effective solution to flow control problems.
More Red Valve Type A Valves are in use than any other Pinch Valve throughout
the world. The secret is in the rubber sleeve - the valve's only wetted
part.
阀门的执行机构，夹管的夹紧动作是通过在套管上施加气压或液压压力实现的。阀体就如同一个内置执行器，因此无需价格昂贵的气动、液动或电动执行器。在阀体和套管的环形空间内施加气压，就能够实现开启、节流或关闭阀门的功能。
Actuation of the valve, the pinching action is accomplished by air
or hydraulic pressure placed on the sleeve. The valve body acts as a built-in
actuator, eliminating costly pneumatic, hydraulic, or electric actuators.
Adding air pressure within the annular space between the body and the
sleeve can open, throttle, or close the valve.
套管的弹性或柔软性使得阀门能够紧密环绕在固体颗粒周围实现“无滴漏”关闭功能，无需担心损坏阀门自身。密封面积相当于阀门长度的95%。美国红阀公司的A型夹管阀，没有阀座或填料需要更换，也没有空穴或死点积存碎渣而阻碍阀门工作。这种夹管阀的抗磨损性能是无可匹敌的。当阀门开启时，整个阀门的流道就像管线上的一节直线管道。A型夹管阀没有可能导致故障的外部连接装置、杠杆、活塞或旋转部件，因此可以用在遥远的地方或恶劣的环境中。一般情况下，只需比管道压力高出25~35 psi的气压即可完全关闭美国红阀公司的A型夹管阀。
The sleeve's flexibility allows the valve to close "drop tight" around
entrapped solids, eliminating hang ups damaging the valve itself. Sealing
area is equal to 95% of the valve's length. With Red Valve Type A Pinch
Valves, there are no seats or packing to replace, or cavities or dead
spots to collect debris and bind valve operation. Their abrasion resistance
is unmatched. When the valve is open, it is like a straight piece of pipe
in the line. Type A Valves are used on remote locations or harsh environments
since there are no external links, levers, pistons, or rotating parts
to cause downtime. In general, 25-35 psi over line pressure is required
for full closure of Red Valve Type A Pinch Valves.
控制
Control
采用调压器或比例继电器调节施加在A型夹管阀上的气压即可实现节流控制或调节阀的功能。通过比例继电器改变气压信号即可调节A型夹管阀。
Throttling control is accomplished by using a booster or proportional
relay to modulate air pressure to the Type A Valve. A changing air signal
through the proportional relay will modulate the Type A Valve.
A型双层夹管阀
Type A Double Wall
A型双层套管夹管阀专用于具有很高磨损性的流体介质应用场合，当应用在研磨泥浆上时，其使用寿命甚至比星状V形球阀和金属阀座阀门更长更耐用。为了额外增加套管的厚度，阀体的尺寸增加了一个级别。
Designed for highly abrasive applications, the Type A Double Wall Sleeve
Valve outlasts even stellated V-Ball valves and metal seated valves on
abrasive slurries. To compensate for the extra sleeve thickness, the valve
body is increased to the next size.
A型锥形夹管阀
Type A Cone
A型阀门配置一个锥形套管，特别专用于节流控制应用场合。通过减少有效流道直径，阀门的流量系数Cv就能够符合所需要的流量系数。
Type A valves equipped with a cone sleeve are designed specifically
for throttling control applications. By reducing the effective port size,
the Cv of the valve can match the Cv required. |
这是唯一能够无滴漏紧密关闭固体颗粒流体的阀门