COMBINED AUTOMATIC VALVE WITH MANUAL OPERATION MECHANISM PART

To provide a compact and simple combined automatic valve with a manual operation mechanism part which comprises a switching function for a manual operation and an automatic operation, and an automatic opening/closing function of a flow passage at the automatic operation, secures manual operability with a simplified internal structure comprising a suppressed number of components, and also improves durability with sufficiently secured wall thicknesses of a stem and a casing.SOLUTION: A stem 34 is arranged above a valve-opening/closing mechanism 21 for opening and closing a flow passage 35 by operating a valve body 31 by a piston 33 which vertically moves in a casing 32. The stem is formed with an air flow passage 80 for opening and closing the valve body by an automatic operation so that the valve body can be operated into a valve-closed state by a manual operation. An air supply/discharge hole 52 which can communicate with either of an air supply path 50 or an air discharge path 51 is formed at an upper external periphery of the stem via seal members 81 to 83 while communicating with the air flow passage, and a pin member 90 for holding the stem in the valve-closed state by being locked to a lock step part 60 at the manual operation is attached to a lower vicinity of the stem.SELECTED DRAWING: Figure 1 【課題】手動操作と自動操作との切換え機能と、自動操作時の流路の自動開閉機能とを備え、部品点数を少なく抑えて内部構造を単純化しつつ手動操作性を確保し、ステムやケーシングの肉厚を十分に確保して耐久性を向上したコンパクトで簡便な手動操作機構部付き複合自動弁を提供する。【解決手段】ケーシング３２内を上下移動するピストン３３で弁体３１を動作させて流路３５を開閉する弁開閉機構２１の上方にステム３４が設けられる。ステムは自動操作により弁体を開閉操作するエア流路８０が形成され、手動操作で弁体を弁閉状態に動作可能に設けられる。ステムの上部外周にエア供給路５０又はエア排出路５１の何れか一方に連通可能なエア給排気孔５２がシール部材８１〜８３を介してエア流路に連通して設けられ、ステムの下部付近に、係止段部６０に手動操作時に係止してステムを弁閉状態に保持するピン部材９０が装着されている。【選択図】 図１