SLOW RETURN CHECK VALVE

• Main Authors: TANAHASHI MINEO, NIWA SUSUMU, NIWA REN, SATO TOSHIHISA
• Format: Patent
• Language: English; Japanese
• Published: 07.04.2023
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

To provide a small-sized slow return check valve capable of adjusting a flow rate of a fluid flowing from a second port toward a first port.SOLUTION: A body 35 of a valve has a first port 44 connected to a first passage 46, and a second port 45 connected to a second passage 47. At a place where the first passage 46 and the second passage 47 intersect, a seat portion 50 of a throttle portion 52 is formed. At a place corresponding to the second passage 47 in the body 35, a cylindrical needle 49 is disposed. The inside of the needle 49 is connected to the first passage 46 and the second passage 47. At an end portion of the needle 49, a valve portion 51 of the throttle portion 52 is formed so as to oppose the seat portion 50. In the needle 49, a valve seat 53 is formed and a valve body 54 and a spring 55 are disposed. The needle 49 can move a fixed position with respect to the body 35 in a direction extending a center line of the needle 49, and can vary a distance between the valve portion 51 and the seat portion 50 on the throttle portion 52 through the movement.SELECTED DRAWING: Figure 5 【課題】第２ポートから第１ポートに向かう流体の流量を調整できる小型のスローリターンチェックバルブを提供する。【解決手段】バルブのボディ３５は、第１通路４６に繋がる第１ポート４４と第２通路４７に繋がる第２ポート４５とを有する。第１通路４６と第２通路４７との交わる箇所には絞り部５２の座部５０が形成される。ボディ３５における第２通路４７に対応する箇所には筒状のニードル４９が配置される。ニードル４９の内部は第１通路４６及び第２通路４７に繋がる。ニードル４９の端部には絞り部５２の弁部５１が座部５０と対向するように形成される。ニードル４９の内部には、弁座５３が形成されるとともに弁体５４及びスプリング５５が配置される。ニードル４９は、ボディ３５に対する固定位置をニードル４９の中心線の延びる方向に移動させることが可能であり、その移動を通じて絞り部５２における弁部５１と座部５０との距離を可変とする。【選択図】図５