CN-116733994-B - Full-clamping-pressure type gate valve structure and manufacturing method thereof

CN116733994BCN 116733994 BCN116733994 BCN 116733994BCN-116733994-B

Abstract

The invention discloses a full-clamping-pressure type gate valve structure and a manufacturing method thereof, wherein the structure comprises a valve body, a valve cover, a valve rod, a flashboard, a hand wheel and the like, a convex shaft is arranged in the middle of the valve rod, a valve rod hole and a mounting hole are arranged in the valve cover, an upper inner shoulder and a lower inner shoulder which are manufactured through a heating spinning process and a positioning groove formed between the upper inner shoulder and the lower inner shoulder are arranged in the valve rod hole, the convex shaft is positioned and rotated in the positioning groove, the convex shaft can be ensured to freely rotate in the positioning groove but not fall off, namely, the valve rod forms positioning rotation in the valve rod hole, meanwhile, a clamping-pressure interface is arranged at a port of the mounting hole of the valve cover, an O-shaped ring which is in sealing contact with the outer surface of the valve body is formed, and a clamping groove is arranged on the outer circumferential surface of the valve cover to fix the valve body and the valve cover, so that the sealing mounting of the valve cover at the top of the valve body is formed.

Inventors

XU WEIFENG
LIN GANG
SHEN GUOQIANG

Assignees

宁波埃美柯铜阀门有限公司

Dates

Publication Date: 20260505
Application Date: 20230620

Claims (2)

1. A full-clamping-pressure type gate valve structure comprises a valve body (1), a valve cover (2), a valve rod (3), a gate plate (4) and a hand wheel (5) and is characterized in that a protruding shaft (31) is arranged in the middle of the valve rod (3), a valve rod hole (22) and a mounting hole (23) are formed in the valve cover (2), an upper inner shoulder (24), a lower inner shoulder (27) and a positioning groove (26) formed between the upper inner shoulder and the lower inner shoulder are formed in the valve rod hole (22), the protruding shaft (31) is rotatably installed in the positioning groove (26) in a positioning mode, the valve cover (2) is installed at the top of the valve body (1) in a sealing mode through the mounting hole (23), a clamping groove (25) is formed in the outer circumferential surface of the valve cover (2) and used for fixing the valve body (1) and the valve cover (2) through the clamping groove, the valve cover (2) is formed by adopting good stainless steel or brass in a punching and stretching mode, a clamping-pressure interface (9) is formed at a port of the mounting hole (23) of the valve cover (2), the valve body is characterized in that an O-shaped ring (8) in sealing contact with the outer surface of the valve body (1) is arranged in the clamping and pressing interface, a convex pipe (11) which is matched and assembled with a mounting hole (23) of the valve cover (2) is arranged at the top of the valve body (1), the mounting hole (23) and the convex pipe (11) are round holes and round pipes which are matched and assembled, a double O-shaped ring (7) is arranged on the outer circumferential surface of the valve rod (3) above the convex shaft (31), clamping and pressing interfaces (9) are respectively arranged at two ends of the valve body (1), and the O-shaped ring (8) is arranged in each clamping and pressing interface.
2. The manufacturing method of the full-clamping-pressure type gate valve structure according to claim 1, characterized by comprising the following steps: step one, selecting a stainless steel hollow tube or a brass hollow tube with proper length and diameter as a valve cover blank according to specifications; Spinning the upper part of the valve cover blank into a valve rod pipe (21) with a reduced outer diameter size by adopting a heating spinning process, forming a valve rod hole (22) in the valve rod pipe, and enabling a mounting hole (23) of the valve cover blank to be positioned below the valve rod hole (22); spinning the upper part of the valve rod pipe (21) by adopting a heating spinning process so as to shrink the outer diameter of the valve rod pipe again, and further forming an upper inner shoulder (24) in the valve rod hole (22); Fourthly, forming a clamping joint (9) at the port of a mounting hole (23) of the valve cover blank by adopting a water expansion forming process, and shaping a valve rod hole (22) to ensure the dimensional fit with the valve rod (3); step five, manufacturing a valve rod, wherein a convex shaft (31) and a double-channel O-shaped ring (7) positioned above the convex shaft are arranged in the middle of the valve rod (3); step six, a valve rod (3) with a double-way O-shaped ring (7) is arranged in a valve rod hole (22) of a valve cover (2) from bottom to top through a mounting hole (23) until an upper step surface (32) of a convex shaft (31) contacts an upper inner shoulder (24) of the valve rod hole (22) to be limited, and the double-way O-shaped ring (7) is in dynamic sealing contact in the valve rod hole (22); Rolling the lower part of the valve rod pipe (21) by adopting a rolling process to reduce the outer diameter of the valve rod pipe again, further forming a lower inner shoulder (27) in the valve rod hole (22), wherein the lower inner shoulder is contacted with a lower step surface (33) of the protruding shaft (31), and a positioning groove (26) for positioning and rotating the protruding shaft (31) of the valve rod (3) is formed between the upper inner shoulder and the lower inner shoulder, so that the protruding shaft (31) can freely rotate in the positioning groove (26) but cannot fall off; Step eight, the valve cover (2) with the valve rod (3) in the step seven is matched with the convex pipe (11) at the top of the valve body (1) through the mounting hole (23), the lower end of the valve rod (3) is connected with the flashboard (4) in the valve body (1), meanwhile, the valve body (1) and the valve cover (2) are fixed by a clamping groove (25) formed by a clamping process on the outer circumferential surface of the valve cover (2), and an O-shaped ring (8) is arranged in the clamping joint (9) to be contacted with the outer surface of the convex pipe (11), so that the mounting seal between the valve cover (2) and the valve body (1) is ensured; Step nine, two ends of the valve body (1) are respectively provided with a clamping and pressing interface (9), and an O-shaped ring (8) is arranged in each clamping and pressing interface; and step ten, installing a hand wheel (5) and a locking nut (6) at the upper end of a valve rod (3) exposed at the top of the valve cover (2), and thus completing the manufacture of the full-clamping gate valve.

Description

Full-clamping-pressure type gate valve structure and manufacturing method thereof Technical Field The invention relates to a gate valve structure in a pipeline valve, in particular to a full-clamping-pressure gate valve structure and a manufacturing method thereof. Background The gate valve is a common cut-off valve in a pipeline system, has the use advantages of small flow resistance coefficient, simple operation, reliable cut-off sealing effect and the like, and has quite wide application range. At present, the structure of the gate valve is generally composed of a valve body, a valve cover, a valve rod, a flashboard, a hand wheel and the like, wherein an axially-through valve rod hole is arranged in the valve cover, the valve rod is arranged in the valve rod hole from top to bottom or from bottom to top, and then is installed in a filling mode or a double-channel O-shaped ring matching shoulder, a snap ring fixing mode and the like, so that the positioning rotation and sealing of the valve rod in the valve rod hole are formed, however, the positioning structure of the rotation sealing is matched through other parts, the assembly process is troublesome, and after the valve rod is rotated for a long time, the condition of valve rod rotation displacement is easy to occur due to the damage of other parts, so that the use reliability of the gate valve is affected. In addition, the valve cover and the valve body are formed into blanks by hot forging or casting by bar stock or copper ingot, and then the blanks are subjected to metal processing and forming, so that the processing cost is increased. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a full-clamping-type gate valve structure which is simple to assemble and reliable to use, and can reduce the processing procedures and the processing cost and a manufacturing method thereof. The technical problems of the invention are realized by the following technical scheme: A full-clamping-pressure type gate valve structure comprises a valve body, a valve cover, a valve rod, a gate plate and a hand wheel, wherein a convex shaft is arranged in the middle of the valve rod, a valve rod hole and a mounting hole are formed in the valve cover, an upper inner shoulder, a lower inner shoulder and a positioning groove formed between the upper inner shoulder and the lower inner shoulder are formed in the valve rod hole, the convex shaft is positioned and rotated and mounted in the positioning groove, the valve cover is mounted at the top of the valve body in a sealing mode through the mounting hole, a clamping groove is formed in the outer circumferential surface of the valve cover, and the valve body and the valve cover are fixed through the clamping groove. The valve cover is formed by stamping and stretching stainless steel or brass with good ductility. The valve cover is characterized in that a clamping and pressing interface is arranged at the port of the mounting hole of the valve cover, and an O-shaped ring which is in sealing contact with the outer surface of the valve body is arranged in the clamping and pressing interface. The top of the valve body is provided with a convex pipe which is matched and assembled with the mounting hole of the valve cover. The mounting holes and the convex pipes are round holes and round pipes which are matched and assembled. The outer circumferential surface of the valve rod above the convex shaft is provided with a double-way O-shaped ring. Two ports of the valve body are respectively provided with a clamping joint, and each clamping joint is internally provided with an O-shaped ring. The manufacturing method of the full-clamping-pressure type gate valve structure comprises the following steps: step one, selecting a stainless steel hollow tube or a brass hollow tube with proper length and diameter as a valve cover blank according to specifications; spinning the upper part of the valve cover blank by adopting a heating spinning process to form a valve rod pipe with a reduced outer diameter, forming a valve rod hole in the valve rod pipe, and enabling a mounting hole of the valve cover blank to be positioned below the valve rod hole; spinning the upper part of the valve rod pipe by adopting a heating spinning process so as to shrink the outer diameter of the valve rod pipe again, and further forming an upper inner shoulder in the valve rod hole; fourthly, forming a clamping and pressing interface at the port of the mounting hole of the valve cover blank by adopting a water expansion forming process, and shaping a valve rod hole at the same time so as to ensure the dimensional fit between the valve rod and the valve rod; step five, manufacturing a valve rod, wherein a convex shaft and a double-channel O-shaped ring positioned above the convex shaft are arranged in the middle of the valve rod; Step six, a valve rod with a double-way O-shaped ring is arranged in a valve rod hole of a valve cov