CONTROL VALVE FOR CONTAMINANT-LADEN GASES

• Main Authors: MORIN J,CA, EVANS A,US
• Format: Patent
• Language: English
• Published: 18.12.1973
• 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; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TAPS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

A control valve for directing the flow of gases which may contain substantial amounts of powder, granular material, or other contaminants, comprising a housing defining two transfer chambers; both chambers are connected to a central port and each chamber is connected to a separate intermediate port and to an end port. An actuator rod extending through both transfer chambers carries two pair of poppets, one pair in each transfer chamber. The poppets in each pair are slidably mounted on the rod, back-to-back, and each poppet is biased away from the other poppet in the pair, toward a retainer mounted on the rod, by a spring interposed between the poppets. Each poppet is faced with a frusto-conical seal of moderately soft elastomer that engages a relatively sharp valve seat in line contact to seal off one of the transfer chambers from the central port or from one of the end ports, the valve being actuated by axial movement of the actuator rod.