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CN-224201130-U - Double-seal anti-scouring stop valve

CN224201130UCN 224201130 UCN224201130 UCN 224201130UCN-224201130-U

Abstract

The utility model discloses a double-seal anti-scouring stop valve which comprises a valve body, a valve rod, a valve clack and a valve seat, wherein an inlet flow passage, a middle cavity and an outlet flow passage which are sequentially communicated are arranged in the valve body, the valve rod stretches into the middle cavity and is connected with the valve clack, the valve seat is arranged in the middle cavity, the valve seat comprises a first step part and a second step part which are axially arranged, a first valve seat sealing part is arranged at the inner edge of the first step part, a second valve seat sealing part is arranged at the inner edge of the second step part, the valve clack comprises a valve clack main body and a sealing ring, the sealing ring is in a conical shape, the sealing ring is detachably arranged on the valve clack main body, and the periphery of the sealing ring is provided with a first valve clack sealing part which is used for being abutted against the first valve seat sealing part and a second valve clack sealing part which is abutted against the second valve seat sealing part. The valve clack sealing part is a detachable replacement structure, and the valve clack sealing part can be directly replaced after the valve clack sealing part is severely worn, so that the whole valve clack is not required to be replaced, and the maintenance cost is greatly reduced.

Inventors

  • WANG YANG
  • LI PING

Assignees

  • 浙江亿控阀门有限公司

Dates

Publication Date
20260505
Application Date
20250618

Claims (10)

  1. 1. The double-seal anti-scouring stop valve comprises a valve body (1), a valve rod (2), a valve clack (3) and a valve seat (4), wherein an inlet flow passage (5), a middle cavity (6) and an outlet flow passage (7) which are sequentially communicated are arranged in the valve body (1), the valve rod (2) stretches into the middle cavity (6) and is connected with the valve clack (3), the valve seat (4) is arranged in the middle cavity (6) and is used for being in sealing fit with the valve clack (3) when the valve is closed, and the double-seal anti-scouring stop valve is characterized in that the valve seat (4) comprises a first step part (8) and a second step part (9) which are axially arranged, a first valve seat sealing part (10) is arranged at the inner edge of the first step part (8), a second valve seat sealing part (11) is arranged at the inner edge of the second step part (9), the valve clack (3) comprises a valve clack main body (12) and a sealing ring (13), the sealing ring (13) is in a conical shape, and the sealing ring (13) is detachably arranged on the valve clack main body (12) and is provided with a first valve seat sealing part (14) which is abutted against the first valve seat sealing part (14).
  2. 2. The double-seal anti-scouring stop valve according to claim 1, wherein a connecting column (16) is arranged at the lower end of the valve clack main body (12), the sealing ring (13) is sleeved on the periphery of the connecting column (16), a plurality of locking bars (17) are arranged on the outer circular surface of the connecting column (16), a plurality of locking grooves (18) matched with the locking bars (17) are arranged on the inner circular surface of the sealing ring (13), and the locking grooves (18) comprise arc-shaped locking parts (19) extending along the circumferential direction of the inner circular surface of the sealing ring (13) and opening parts (20) extending downwards from the upper end of the sealing ring (13) and communicated with the corresponding arc-shaped locking parts (19).
  3. 3. The double-seal anti-scouring stop valve according to claim 2, wherein a damping protrusion (21) for preventing the lock rod (17) from sliding out of the arc-shaped locking part (19) is arranged on the inner wall of the arc-shaped locking part (19).
  4. 4. The double-seal anti-scouring stop valve according to claim 2, wherein a plurality of screw holes (22) are formed in the periphery of the connecting column (16), one end of the lock rod (17) is in threaded connection with the corresponding screw hole (22), and an inner hexagonal groove (23) is formed in the other end of the lock rod (17).
  5. 5. The double-seal anti-scouring stop valve according to claim 2, wherein the lower end of the connecting column (16) is in threaded connection with a conical flow guide head (24) with a large upper end and a small lower end, and the outer diameter of the upper end of the conical flow guide head (24) is equal to the outer diameter of the lower end of the sealing ring (13).
  6. 6. The double-seal anti-scouring stop valve according to claim 5, wherein a first sealing gasket (25) is clamped between the sealing ring (13) and the valve clack main body (12), and a second sealing gasket (26) is clamped between the sealing ring (13) and the conical flow guide head (24).
  7. 7. The double-seal anti-scouring stop valve according to claim 1, wherein a connecting groove (27) is formed in the upper end of the valve clack main body (12), an inverted T-shaped connecting portion (28) is formed in the lower end of the valve rod (2), and a gland (29) for pressing the inverted T-shaped connecting portion (28) into the connecting groove (27) is connected to the upper end of the connecting groove (27) in a threaded manner.
  8. 8. The double-seal anti-scouring stop valve according to claim 1, further comprising a rectifying sleeve (30) and a threaded compression ring (31), wherein the rectifying sleeve (30) is arranged at the upper end of the valve seat (4), a plurality of pressure reducing holes (32) are formed in the rectifying sleeve (30), and the threaded compression ring (31) is in threaded connection with the middle cavity (6) and abuts against the upper end of the rectifying sleeve (30) so that the valve seat (4) is compressed at the lower end of the middle cavity (6).
  9. 9. The double-seal anti-scouring stop valve according to claim 8, wherein a third sealing gasket (33) is arranged between the valve seat (4) and the lower end of the middle cavity (6).
  10. 10. The double-seal anti-scouring stop valve according to claim 8, wherein a plurality of operation grooves (34) are formed in the upper end of the threaded compression ring (31).

Description

Double-seal anti-scouring stop valve Technical Field The utility model relates to the technical field of valves, in particular to a double-seal anti-scouring stop valve. Background The shut-off valve is also called a shut-off valve, and belongs to a forced sealing type valve, so that when the valve is closed, pressure must be applied to the valve clack so as to force the sealing surface not to leak. When a medium enters the valve from the lower part of the valve clack, the resistance which needs to be overcome by the operation force is the friction force of the valve rod and the filler and the thrust generated by the pressure of the medium, and the force for closing the valve is larger than the force for opening the valve, so that the diameter of the valve rod is larger, otherwise, the valve rod is in a bending fault. The Chinese patent application No. CN201811424419.4 discloses a double-seal stop valve which has a double-seal pair structure, in the valve closing process, the annular seal pair forms a seal at first, the effect of reducing pressure and throttling is achieved, impurities are blocked from entering the area of the conical seal pair, a small amount of medium after throttling is utilized to sweep the area of the conical seal pair, impurities in the area are taken away, the sealing surface is self-cleaned, the impurities are effectively prevented from being remained on the sealing surface, meanwhile, the annular seal pair reduces the pressure difference of the conical seal pair, the service life of the sealing pair is prolonged, the problem that the sealing surface is not tightly closed or is crushed by the valve is effectively solved, the scouring of high-speed medium to the sealing surface is avoided, and the working reliability of the stop valve is greatly improved. However, this structure is worn after long-term use, and thus the sealing performance is deteriorated due to the wear of the double seal auxiliary structure, and therefore, if the valve flap and the valve stem are integrated, the valve flap and the valve stem are required to be replaced, and the maintenance cost is high, and therefore, improvement of this structure is necessary. Disclosure of utility model The utility model aims to provide a double-seal anti-scouring stop valve, wherein the sealing part of the valve clack is of a detachable replacement structure, and the valve clack can be directly replaced after the valve clack is seriously worn, so that the whole valve clack is not required to be replaced, and the maintenance cost is greatly reduced. The double-seal anti-scouring stop valve comprises a valve body, a valve rod, a valve clack and a valve seat, wherein an inlet flow passage, a middle cavity and an outlet flow passage which are sequentially communicated are arranged in the valve body, the valve rod stretches into the middle cavity and is connected with the valve clack, the valve seat is arranged in the middle cavity and is used for being in sealing fit with the valve clack when the valve is closed, the valve seat comprises a first step part and a second step part which are arranged along the axial direction, a first valve seat sealing part is arranged at the inner edge of the first step part, a second valve seat sealing part is arranged at the inner edge of the second step part, the valve clack comprises a valve clack main body and a sealing ring, the sealing ring is in a conical shape and is detachably arranged on the valve clack main body, and a first valve clack sealing part which is used for being abutted against the first valve seat sealing part and a second valve clack sealing part which is abutted against the second valve seat sealing part are arranged on the periphery of the sealing ring. Through adopting above-mentioned technical scheme, set up two seal pair structures, even one of them seal pair wearing and tearing, another seal pair can also play sealed effect, and when two seal pairs damage, owing to be provided with the sealing ring of first valve clack sealing part and second valve clack sealing part for detachable structure, only need change the sealing ring can, need not to change whole valve clack, greatly reduced maintenance cost. The utility model is further characterized in that the lower end of the valve clack main body is provided with a connecting column, the sealing ring is sleeved on the periphery of the connecting column, the outer circular surface of the connecting column is provided with a plurality of locking bars, the inner circular surface of the sealing ring is provided with a plurality of locking grooves matched with the locking bars, and each locking groove comprises an arc-shaped locking part extending along the circumferential direction of the inner circular surface of the sealing ring and an opening part extending downwards from the upper end of the sealing ring and communicated with the corresponding arc-shaped locking part. Through adopting above-mentioned technical scheme, when