JP3444436B2 - Stopper mechanism of gate valve with rotary sliding gland structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper mechanism capable of determining the amount of tightening of a valve element such as an internally threaded gate valve and performing fine adjustment thereof. 2. Description of the Related Art Generally, a valve body of an internally threaded gate valve is an integral type having a valve rod penetrating therein, and has high rigidity and can withstand a large operating force. The stoppers used for these are mainly used to maintain the fully open and fully closed states.
In addition, the low-temperature gate valve employs a flexible valve body or the like which is hardly affected by temperature in order to increase the airtightness of the valve seat. These valve bodies have a low rigidity and require a stopper to restrict tightening and maintain an optimum tightening position. FIGS. 3 and 4 show a conventional internal threaded gate valve and its stopper mechanism (lock type). 30 is the main body,
31 is a valve body, 32 is a valve stem, 33 is a valve stem collar, 34 is a handle wheel for rotating the valve stem 32, and the gate valve (valve element 31) is locked as shown in FIG. FIG. 4 shows a method of locking the steering wheel 34 using the chain 35.
As shown in FIG. 7, there is a method in which the nut 36 is tightened to lock the valve stem 32 by the frictional force of the valve stem collar 33. [0005] As shown in FIG.
7, the split pin 38 is engaged with the slit 40 of the stopper 39 formed with the cross-shaped slit 40 as shown in FIGS. 6 and 7, and the seating surface (lower end) of the stopper 39 and the sleeve 41. A mechanism for determining the amount of tightening when the surface hits is also known. However, the stopper mechanism of the above conventional gate valve has the following disadvantages. A. In the case of the conventional internal thread type gate valve, since the position is fixed using the lock chain 35 and the nut 26 each time after opening and closing, there is no reproducibility of the valve body position, which is not suitable for a flexible valve body or the like. B. The open / close position of the valve cannot be determined in advance. C. Since the conventional stopper 39 for the flexible valve element is adjusted through the slit 40 provided in the stopper 39, fine adjustment cannot be performed. D. All of the stopper mechanisms are difficult to make fine additional adjustments to cope with valve seat friction and the like. An object of the present invention is to provide a stopper mechanism for a gate valve having a rotary sliding gland structure.
-D are eliminated. The structure of the stopper mechanism of the gate valve having the rotary sliding gland structure according to the present invention is as follows. In a gate valve having a configuration in which the upper end of a valve stem is inserted into a drive sleeve that is rotated by a handle wheel, and the valve stem slides up and down by a feed screw mechanism between the drive sleeve and the valve stem to open and close the valve body, A packing gland provided with a number of bolt screw holes on concentric lines is mounted on the sleeve gage that rotatably supports the sleeve,
A stopper adjustment fitting having a vertical slit formed on the upper surface and having a stopper bolt hole outside the cylinder is disposed on the packing holder, and a drive sleeve of a portion of the stopper adjustment fitting located in the cylinder. With a stopper feed screw and a step at the bottom,
An inner screw is screwed into the stopper feed screw, and a stopper is provided such that a horizontal protrusion is engaged in a cylindrical slit of the stopper adjustment fitting. The packing is provided through a stopper bolt hole of the stopper adjustment fitting. A stopper mechanism for a gate valve having a rotary sliding gland structure, wherein a stopper bolt for screwing into a bolt screw hole provided in a retainer to arbitrarily fix a stopper adjusting bracket is provided. When the valve body is fully opened, the stopper is located above the cylinder of the stopper adjusting bracket (above the stopper feed screw of the drive sleeve), and the drive sleeve is rotated by rotating the handle wheel. Then, since the protrusion is engaged with the slit of the cylinder and its rotation is prevented, the stopper descends in the cylinder and eventually hits the step (thrust washer) of the drive sleeve. At this time, the valve body is in the fully closed position, and even if the steering wheel is further rotated, the stopper prevents the further rotation, and further tightening cannot be performed. When opening the valve body, when the steering wheel is rotated in the opposite direction, the stopper rises up to a certain position in the cylinder, contrary to the above. To adjust the position where the stopper acts, when the stopper adjusting bracket is rotated, for example, in the feed direction of the stopper feed screw of the drive sleeve, the position of the cylindrical slit changes, and the stopper is sent together. As a result, the stopper is quickly moved. Effective, the amount of tightening is small. Conversely, when the stopper adjustment bracket is rotated in the direction opposite to the feed direction, the stopper works slowly and the tightening amount increases. In this way, the amount of tightening of the valve body can be adjusted. When the effective position of the stopper is determined, the stopper adjusting bracket is fixed by screwing the stopper bolt into the bolt screw hole through the stopper bolt hole. FIG. 1 shows an embodiment of the present invention. 1 is a valve body, 2 is a drive sleeve holder, 3 is a drive sleeve, 4
Is a thrust flange, and 5 is a valve stem. When the screw 5 'of the valve stem 5 is engaged with the feed nut 3' of the drive sleeve 3, the valve stem 5 slides up and down to open and close the valve element. Reference numeral 6 denotes a handle wheel for rotating the drive sleeve 3 (for opening and closing the valve body), 7 a packing, and 8 a packing holder. The packing holder 8 is provided on a concentric line as shown in FIG.
, A number of bolt screw holes 10 are provided as shown by dotted lines. 9 is a packing holding fixing bolt. Numeral 11 denotes a stopper adjusting member arranged on the upper surface of the packing retainer 8. A cylindrical member 12 having a vertical slit 13 is formed on the upper surface of the stopper adjusting member 11, and a stopper adjusting member is provided. Hardware 8
A stop bolt hole 22 is provided at a position in contact with the bolt screw hole 10. 14 is an acrylic pipe, 15 is a cap, and 16 is a dust seal. Reference numeral 17 denotes a stopper. The stopper 17 is located in the cylinder 12, the projection 18 is engaged with the slit 13, and a nut screw 23 formed in the center is provided with a stopper feeder formed in the drive sleeve 3. It is engaged with the screw 19. Reference numeral 20 denotes a step portion (thrust washer) of the drive sleeve 3, and reference numeral 21 denotes a stopper bolt. The stopper adjusting bracket 11 is arbitrarily rotated by screwing the stopper adjusting bracket 11 from the stopper bolt hole 22 into the bolt screw hole 10. Can be fixed. In the above embodiment, when the valve element is fully open,
The stopper 17 is located above the cylinder 12 of the stopper adjustment fitting 11 (above the stopper feed screw 19 of the drive sleeve 3). When the drive sleeve 3 is rotated by rotating the handle wheel 6, the stopper 17 protrudes. Since the portion 18 is engaged with the slit 13 of the cylinder 12 and is prevented from rotating, the portion 18 descends in the cylinder 12 and eventually hits the step (thrust washer) 20 of the drive sleeve 3.
At this time, the valve body is in the fully closed position, and even if the steering wheel 6 is to be further rotated, the stopper 17 prevents the further rotation, and further tightening cannot be performed. To open the valve body, when the handle wheel 6 is rotated in the opposite direction, the stopper 17 rises up to a certain position in the cylinder 12 contrary to the above. The adjustment of the position where the stopper 17 acts is
When the stopper adjusting bracket 11 is rotated in the feed direction of the stopper feed screw 19 of the drive sleeve 3, for example, the cylinder 12 is rotated.
The position of the slit 13 changes, and together with the stopper 17
Is transmitted, and as a result, the stopper works quickly and the tightening amount is reduced. Conversely, when the stopper adjusting bracket 11 is rotated in the direction opposite to the feed direction, the stopper 17 works slowly,
The tightening amount increases. Thereby, the amount of tightening of the valve element can be adjusted. Thus, the stopper 1
When the effect (position) of 7 is determined, the stopper adjustment bracket 1
1 is fixed by screwing the stopper bolt 21 from the stopper bolt hole 22 into the bolt screw hole 10. The effects of the present invention are as follows. A. Adjustment of the tightening amount of the valve body is easier than in the conventional structure. B. Since the disassembly and assembly can be performed only by removing and attaching the stopper bolt, a skilled technique is not required for adjusting the tightening amount of the valve body. C. Fine adjustment of the stopper is possible (fine adjustment of about 3 times of the conventional type is possible). For example, valve stem φ24,5
When the pitch P is 5.08 mm with a thread 1 thread, the conventional split pin hole 4 (every 90 °) → the valve element tightening adjustment width P / 4 = 1.
When the bolt screw hole 10 of the present case is 12, whereas the bolt screw hole 10 is 12 (every 30 °) → the valve element tightening adjustment width P / 12 = 0.42
It becomes. D. Since the amount of tightening of the valve body can be adjusted optimally, valve body protection, valve seat airtightness performance and operability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a stopper mechanism according to the present invention. FIG. 2 is a view taken along the line AA ′. FIG. 3 is an explanatory view of a stopper mechanism using a lock chain in a conventional internally threaded gate valve. FIG. 4 is an explanatory view of a stopper mechanism using a tightening nut in a conventional internal thread type gate valve. FIG. 5 is an explanatory view of a conventional split pin type stopper mechanism. FIG. 6 is a sectional view of a conventional split pin type stopper. FIG. 7 is a plan view of a conventional split pin type stopper. [Description of Signs] 1 Body 2 Drive sleeve retainer 3 Drive sleeve 4 Thrust flange 5 Valve stem 6 Handle wheel 7 Packing 8 Packing retainer 9 Fixing bolt 10 Bolt screw hole 11 Stopper adjusting fitting 12 Cylindrical 13 Slit 14 Acrylic pipe 15 Cap 16 Dust seal 17 Stopper 18 Projection 19 Stopper feed screw 20 Step (thrust washer) 21 Stop bolt 22 Stop bolt hole 23 Nut screw

Continued on the front page (72) Inventor Kentaro Kimoto 350-3-205 Kozuki-cho, Kohoku-ku, Yokohama, Kanagawa Prefecture (72) Inventor Takahide Sugiyama 10-15-302, Sakae-cho, Kita-ku, Tokyo (72) Inventor Shinohara Atsushiya 563, Otana-cho, Kohoku-ku, Yokohama-shi, Kanagawa-ken (72) Inventor Taizo Hoshino 1026, Oji-negoya, Horinouchi-cho, Kitauonuma-gun, Niigata (56) References JP-A-3-9186 (JP, A) (58) (Int.Cl. ⁷ , DB name) F16K 3/00-3/36 F16K 35/00-35/16 F16K 31/50

Claims (1)

(57) [Claims] [Claim 1] Insert the upper end of a valve stem into a drive sleeve rotated by a handle wheel, and slide the valve stem up and down by a feed screw mechanism between the drive sleeve and the valve stem. A valve that opens and closes the valve body to open and close the valve body. A packing retainer with a number of bolt screw holes on concentric circles is mounted on a sleeve retainer that rotatably supports the drive sleeve. And a stopper adjustment fitting having a stopper bolt hole outside the cylinder is disposed on the packing retainer. A stopper feed screw is provided on a drive sleeve of a portion of the stopper adjustment fitting located in the cylinder. And an inner screw is screwed into the stopper feed screw, and a horizontal protruding part is provided in a cylindrical slit of the stopper adjusting bracket. A stopper that engages with the bolt; and a stopper bolt that is screwed into a bolt screw hole provided in the packing retainer via a stopper bolt hole of the stopper adjustment bracket to arbitrarily fix the stopper adjustment bracket. A stopper mechanism for a gate valve having a rotary sliding gland structure.