A gate valve for controlling flow of a fluid therethrough is provided. The gate valve includes a valve body having an outer surface, a bore, a valve cavity, a first seat pocket, a second seat pocket, and first and second fluid ports extending from the outer surface to the first and second seat pockets, respectively. First and second seats are positioned respectively within the first and second seat pockets. The seats include circumferential fluid channels and one or more conduits in fluid communication with the fluid ports for permitting a repair fluid to be injected into the ports to the faces of the seats. A gate is slidably positioned within the valve cavity between the first seat and the second seat for controlling flow of a fluid through the valve. Sand shields are also provided at the rear of the seats to capture particulates and to bias the seats against the gate.

A gate valve for controlling flow of a fluid therethrough is provided. The gate valve includes a valve body having an outer surface, a bore, a valve cavity, a first seat pocket, a second seat pocket, and first and second fluid ports extending from the outer surface to the first and second seat pockets, respectively. First and second seats are positioned respectively within the first and second seat pockets. The seats include circumferential fluid channels and one or more conduits in fluid communication with the fluid ports for permitting a repair fluid to be injected into the ports to the faces of the seats. A gate is slidably positioned within the valve cavity between the first seat and the second seat for controlling flow of a fluid through the valve. Sand shields are also provided at the rear of the seats to capture particulates and to bias the seats against the gate.

A regulator performing fluid control includes an annular protruding portion having a valve seat on its leading end and an annular diameter-decreasing surface formed by decreasing an inner diameter of the annular protruding portion toward a valve hole. The regulator includes a valve element provided with a contact surface to be in contact with the valve seat and a columnar step portion provided on an inner peripheral side of the valve seat protruding from the contact surface toward the valve hole, the step portion having a diameter larger than an inner diameter of the valve hole and being coaxially formed with the valve hole. An annular ridge is formed by an outer peripheral surface of the step portion intersecting an end face of the step portion on the valve-hole side with the annular diameter-decreasing surface to constitute a passage narrowing portion.

A regulator performing fluid control includes an annular protruding portion having a valve seat on its leading end and an annular diameter-decreasing surface formed by decreasing an inner diameter of the annular protruding portion toward a valve hole. The regulator includes a valve element provided with a contact surface to be in contact with the valve seat and a columnar step portion provided on an inner peripheral side of the valve seat protruding from the contact surface toward the valve hole, the step portion having a diameter larger than an inner diameter of the valve hole and being coaxially formed with the valve hole. An annular ridge is formed by an outer peripheral surface of the step portion intersecting an end face of the step portion on the valve-hole side with the annular diameter-decreasing surface to constitute a passage narrowing portion.

A double-seat valve includes a housing having a passage between first and second connections. First and second valve disks are arranged in a housing internal space. A leakage space formed in the passage in the valve closed position is sealed off by the second valve disk. A hollow rod connected to the first valve disk has a leakage channel connecting the leakage space and a housing part. A cleaning gap is formed between the second valve disk and a passage wall. A housing opening is sealed with a diaphragm that separates the housing part from the internal space. A section of the first valve disk is received in an opening contour in the passage in the valve closed position, and delimits a cut-out in the first valve disk, in which the second valve disk is received in the valve open position.

A double-seat valve includes a housing having a passage between first and second connections. First and second valve disks are arranged in a housing internal space. A leakage space formed in the passage in the valve closed position is sealed off by the second valve disk. A hollow rod connected to the first valve disk has a leakage channel connecting the leakage space and a housing part. A cleaning gap is formed between the second valve disk and a passage wall. A housing opening is sealed with a diaphragm that separates the housing part from the internal space. A section of the first valve disk is received in an opening contour in the passage in the valve closed position, and delimits a cut-out in the first valve disk, in which the second valve disk is received in the valve open position.

Valve and related assemblies, systems, and methods may include a self-cleaning feature that may be configured to at least partially displace material from a portion of the valve. Such valves may be utilized in a pressure exchanger.

Disclosed is a powder protecting three-way valve for a semiconductor or flat panel display manufacturing apparatus, including: a valve casing including an inlet and a plurality of outlets; a rotating ball rotatably installed in the valve casing to control a flow direction of reaction by-product gas; a nitrogen gas supply member which receives nitrogen gas from an outside, guides a flow of the nitrogen gas using a guide path, and supplies the nitrogen gas into the valve casing to prevent a powder contained in the reaction by-product gas from accumulating in the valve casing; and a heating unit installed in the nitrogen gas supply member to heat the nitrogen gas passing through an interior of the nitrogen gas supply member. The nitrogen gas supply member is formed as a thin flat body pressed against one side surface of the valve casing and is integrally coupled to the valve casing.

Disclosed is a powder protecting three-way valve for a semiconductor or flat panel display manufacturing apparatus, including: a valve casing including an inlet and a plurality of outlets; a rotating ball rotatably installed in the valve casing to control a flow direction of reaction by-product gas; a nitrogen gas supply member which receives nitrogen gas from an outside, guides a flow of the nitrogen gas using a guide path, and supplies the nitrogen gas into the valve casing to prevent a powder contained in the reaction by-product gas from accumulating in the valve casing; and a heating unit installed in the nitrogen gas supply member to heat the nitrogen gas passing through an interior of the nitrogen gas supply member. The nitrogen gas supply member is formed as a thin flat body pressed against one side surface of the valve casing and is integrally coupled to the valve casing.

A passive explosion isolation valve (10) is provided that comprises vertically-oriented gate members (40, 42) configured to close automatically in response to an energetic event occurring downstream of the valve. The valve (10) may be optionally equipped with a valve seat cleaning assembly (46) configured to removed accumulated particulate material away from the area of the valve seat (48) and/or one or more latch assemblies (44) configured to secure the gate members (40, 42) in the closed position following closure of the valve (10) in response to an energetic event.