一、进口气动法兰闸阀产品简介

美国威盾VTON气动法兰闸阀是具有气动执行机构（双层气缸，并带有缓冲机构）和手动及其保护机构（手动和可自锁的气动-手动转换装置）的低支架明杆气动闸阀。采用双层气缸结构，其与单气缸式气动闸阀相比，提升力增大了一倍。这就从根本上解决了单气缸气动闸阀的某些阀体内楔死而打不开的弊病。而且，由于气动闸阀具备缓冲机构，能有效地减速轻了关闭阀门时，由于活塞下行冲击而造成的阀板车密封面和阀体密封面的磨损。

The American Weidun VTON pneumatic flange gate valve is a low stand rising stem pneumatic gate valve with a pneumatic actuator (double-layer cylinder with buffer mechanism) and a manual and its protection mechanism (manual and self-locking pneumatic manual switching device). Adopting a double-layer cylinder structure, its lifting force is doubled compared to a single cylinder pneumatic gate valve. This fundamentally solves the problem of some valve bodies of single cylinder pneumatic gate valves being wedged tightly and unable to open. Moreover, due to the buffering mechanism of the pneumatic gate valve, it can effectively reduce the wear of the valve plate car sealing surface and valve body sealing surface caused by the downward impact of the piston when closing the valve.

二、进口气动法兰闸阀产品特点

1、本阀主要由阀体、阀盖、闸板、阀杆、密封圈、双层气缸及其活塞、活塞杆、隔板连同缓冲机构、手动机构、气动-手动转换装置和阀盖填料装置等部分组成。
2、上活塞行至行程上端可顶上上回讯器，使之发讯；下活塞行之行程下端可顶下下回讯器，使之发讯，以作为闸阀开闭信息在中央操作室的模拟仪表盘上进行显示。
3、手轮上部的外伸指示杆的上升和下降，标志着该阀的闸板是处于提升状态还是下降状态。闸阀关闭时，外伸指示杆位于最低位置；反之，闸阀全开时，外伸指示杆位于最高位置。此即为本阀启闭状态的现场指示。
4、气缸盖上部装有气动-手动转换装置。将转换手柄顺时针方向提转到“气动”定位孔定位，闸阀处于气动操作状态；反之，将转换手柄逆时针方向提转到“手动”定于孔处定位，闸阀即可进行手动操作。带锥齿轮的手柄转换方向相反。 手动操作闸阀时，手轮旋向和普通手动阀一样，即顺时针转为关，逆时针转为开。带锥齿轮转动的相反。可以气动控制也可以手动控制。

1. This valve is mainly composed of valve body, valve cover, gate plate, valve stem, sealing ring, double-layer cylinder and its piston, piston rod, partition, buffer mechanism, manual mechanism, pneumatic manual switching device, and valve cover packing device.

2. When the upper piston reaches the upper end of the stroke, it can push up the upper indicator to send a signal; The lower end of the stroke of the lower piston can push the lower return sensor to send signals, which are displayed on the analog instrument panel in the central control room as gate valve opening and closing information.

3. The upward and downward extension of the indicator rod on the upper part of the handwheel indicates whether the valve gate is in an upward or downward state. When the gate valve is closed, the extended indicator rod is in the lowest position; On the contrary, when the gate valve is fully open, the extended indicator rod is at the highest position. This is the on-site indication of the opening and closing status of this valve.

4. The upper part of the cylinder head is equipped with a pneumatic manual switching device. Turn the conversion handle clockwise to the "pneumatic" positioning hole for positioning, and the gate valve is in pneumatic operation state; On the contrary, turn the conversion handle counterclockwise to the "manual" position at the hole, and the gate valve can be manually operated. The handle with bevel gears switches in the opposite direction. When manually operating the gate valve, the handwheel rotates in the same direction as a regular manual valve, that is, clockwise to close and counterclockwise to open. The opposite direction of rotation with bevel gears. It can be controlled pneumatically or manually.

三、进口气动法兰闸阀零件材质表