PROPORTIONAL FLOW CONTROL POPPET VALVE WITH FLOW CONTROL NEEDLE

• Main Authors: WILLIAMS KEVIN C, DAVID M SOBKA
• Format: Patent
• Language: English; Japanese
• Published: 13.08.2020
• 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 flow control valve that can provide better flow resolution at low fluid flow rates.SOLUTION: A flow control valve 10 includes a valve body 11, a stepping motor 41, and valve member 28. The valve member 28 includes a poppet 30 that can slide longitudinally within a bore 19 of the valve body 11 when the stepping motor 41 receives electricity. A diaphragm 48, extending inwardly from the valve body 11 to the valve member 28, deflects in response to movement of the valve member 28. A flow control needle 49, mounted on the poppet 30 of the valve member 28, is at least partially received in an outlet port 23. The flow control needle 49 cooperates with an inner surface of the outlet port 23 to define an outlet flow orifice that varies in size when the valve member 28 moves between open and closed positions. In the closed position, a seat engagement surface 47 of the valve member 28 contacts a valve seat 18 of the valve body 11 to create a fluid-tight seal.SELECTED DRAWING: Figure 2 【課題】低い流体流量でより良好な流量分解能を提供できる流量制御弁を提供する。【解決手段】流量制御弁１０は、弁本体１１と、ステッピングモータ４１と、弁部材２８とを備える。弁部材２８は、ステッピングモータ４１が通電されると、弁本体１１のボア１９内を長手方向に摺動可能なポペット３０を備える。弁本体１１から弁部材２８に内側に向かって延出するダイアフラム４８が、弁部材２８の移動に応じて撓む。流量制御針４９は、弁部材２８のポペット３０に搭載され、出口２３に少なくとも一部が収容される。流量制御針４９は、出口２３の内面と協働し、弁部材２８が開位置と閉位置の間を移動する際サイズが変わる出口流量オリフィスを規定する。閉位置において、弁部材２８の弁座係合面４７は、弁本体１１の弁座１８と当接し、流体密封シールを形成する。【選択図】図２