| 主权项 |
1. A valve comprising:
a body (20) including a fluid passage (21), with the body (21) further including a top portion (22) having a chamber (23) in communication with the fluid passage (21); a cap (80) mounted to the top portion (22) of the body (20) and sealing the chamber (23), with the cap (80) including an axial hole (81) aligned with the chamber (23) in a longitudinal direction; a valve rod (40) including upper and lower ends (41, 42) spaced from each other in the longitudinal direction, with the valve rod (40) received in the chamber (23) of the body (20) and the axial hole (81) of the cap (80), with a hand wheel (43) mounted to the upper end (41) of the valve rod (40), with a plug (44) mounted to the lower end (42) of the valve rod (40), with the hand wheel (43) rotatable to move the valve rod (40) and the plug (43) in the longitudinal direction between an open position and a closed position to open or close the fluid passage of the body (20); a stretchable jacket (32) stretchable in a stretching direction parallel to the longitudinal direction, with the stretchable jacket (32) including first and second ends (322, 323) spaced from each other in the stretching direction and a deformation section (33) between the first and second ends (322, 323) of the stretchable jacket (32), with the stretchable jacket (32) further including a through-hole (321) receiving the valve rod (40), with the first end (322) of the stretchable jacket (32) sealingly coupled a lower end of the through-hole (81) of the cap (80), with the second end (323) of the stretchable jacket (32) fixed to the valve rod (40); and a first limiting unit (35) including a pull rod (37) and a stop (39), with the stop (39) located at the deformation section (33) of the stretchable jacket (32), dividing the stretchable jacket (32) into a first stretchable section (324) between the second end (323) of the stretchable jacket (32) and the stop (39) and a second stretchable section (325) between the stop (39) and the first end (322) of the stretchable jacket (32), with the stop (39) including a through-hole (393) extending in a direction parallel to the stretching direction, with the pull rod (37) including first and second ends (371, 372) spaced from each other in the longitudinal direction, with the second end (372) of the pull rod (37) fixed in relation to the valve rod (40), with the pull rod (37) slideably extending through the through-hole (393) of the stop (39), with a first positioning member (36) mounted on the first end (371) of the pull rod (37), with a second positioning member (38) mounted on the pull rod (37) and located between the stop (39) and the second end (372) of the pull rod (37), with the stop (39) located between the first and second positioning members (36, 38), with the first and second positioning members (36, 38) limiting travel of the pull rod (37) in the longitudinal direction, wherein when the valve rod (40) moves in the longitudinal direction to move the plug (44) from the open position to the closed position, the stretchable jacket (32) is stretched, and stretching of the first stretchable section (324) in the longitudinal direction is stopped when the first positioning member (36) comes in contact with the stop (39), and wherein when the valve rod (40) moves in the longitudinal direction to move the plug (44) from the closed position to the open position, the first stretchable section (324) restores its shape, and restoration of the first stretchable section (324) is stopped when the second positioning member (38) comes in contact with the stop (39). |
