JP2007162776A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve which has the sealing function provided with excellent sealing performance and durability, even for a comparatively small-sized one. <P>SOLUTION: The quick-stop check valve comprises springs 16 and 17 penetrating at least an end of a valve spindle 5, extending to a valve box 2 outside, and elastically urging the rotational force in the direction in which a valve element 3 is seated in a valve seat 4 for a valve rod 5 outside the valve box 2. A gland case 30 is installed in a penetration portion allowing the valve rod 5 to pierce the valve box 2. In the gland case 30, O-rings 31 and 32 contacting the valve rod, an O-ring case 33 arranged to cover the O-rings 31 and 32 having a clearance from the inner periphery surface of the gland case 30, an X-ring 34 to seal the side surface of the O-ring case 33 and the inside side surface of the gland case 30, and a fluororesin-made ring 35 installed between the outer side surfaces of the O-ring case 33 and the gland case 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  According to the present invention, at least one end of the valve rod is penetrated and extended to the outside of the valve box, and the rotational force in the direction in which the valve body is seated on the valve seat is elastically applied to the valve rod outside the valve box. The present invention relates to a quick closing type check valve equipped with an elastic biasing means for biasing.

Japanese Utility Model Publication No. 46-33516 Japanese Utility Model Publication No. 53-42807

  Conventionally, for example, a check valve disposed in the middle of a water supply pipe is equipped with an elastic biasing means having a spring in order to close the check valve rapidly in order to prevent backflow and water hammer. Is common. In this case, when the liquid flowing in the water pipe is dirty water or corrosive liquid, it is impossible to provide elastic urging means inside the valve. Further, the valve stem is extended outward, and an elastic biasing means is attached to the extension portion of the valve stem outside the valve box. This is called an exterior spring type quick-closed check valve, and it is currently in active use.

  By the way, in the above-described check valve, since the valve stem passes through the valve box and reaches the outside, a mechanism for preventing leakage from the valve stem is indispensable. Various such sealing mechanisms have been proposed, and a typical one is the sealing mechanism shown in FIG. In the mechanism of FIG. 5, two O-rings 52 and 53 are provided in one O-ring case 51 in a ground case 50 in which the sealing mechanism is provided. It is configured to prevent leakage from the direction.

  Such a sealing mechanism has a passing score in terms of sealing performance and durability, but there is a problem that it cannot be installed in a space in the case of a relatively small check valve having a diameter of 300 mm or less.

  In view of the above-described conventional circumstances, an object of the present invention is to provide a check valve having a sealing function with good sealing performance and durability even if it is relatively small.

  In order to achieve the above object, the present invention extends at least one end of a valve stem to the outside of the valve casing, and the direction in which the valve element is seated on the valve seat with respect to the valve stem outside the valve casing. In a quick check type check valve equipped with an urging means for urging the rotational force to the valve, a ground case is provided in a penetrating portion where the valve rod penetrates the valve box, and the valve An O-ring in contact with the rod; an O-ring case that covers the O-ring and is disposed with a gap from the inner peripheral surface of the ground case; and sealing means that seals the side surface of the O-ring case and the inner side surface of the ground case And a check valve characterized in that a sliding ring member provided between the O-ring case and the outer side surface of the ground case is provided.

The present invention is effective when the sealing means is an X-ring that automatically seals with pressure water.
Furthermore, the present invention is effective when the sealing means is a V-ring that automatically seals with pressure water.

  Furthermore, the present invention is effective when the ring member is a fluororesin ring.

  According to the configuration of the present invention, it is possible to reliably prevent leakage of pressure water and to prevent uneven wear of the valve stem bearing portion, thereby greatly extending the life.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory cross-sectional view of a check valve according to the present invention.
In FIG. 1, reference numeral 1 is a check valve, 2 is its valve box, and 3 is a valve body. As shown in FIGS. 1 to 3, a valve body arm (not shown) formed on the valve body 3 is fixed to the valve body 5. The valve stem 5 is mounted on the valve box 11 by a bearing bush 6 so as to be rotatable and movable in the axial direction. Since the valve stem 5 penetrates the valve box 2 and protrudes outward, a gland mechanism, which will be described in detail later, is provided to prevent pressure water from leaking.

  A spring lever arm 10 is fixed by setscrews 11 and 12 to a portion of the valve stem 5 that appears outside the valve box 2, that is, outside the gland mechanism, and pins 13 are provided near both ends of the spring lever arm 10. 14 are attached. Further, as shown in FIG. 3, the valve box 2 is provided with a spring base 15 formed in a substantially diamond shape, and the spring base 15 is fixed to the valve box 2 with a bolt (not shown). On the spring base 15, springs 16 and 17 as elastic urging means are respectively engaged with pins 18 and 19 provided near both ends of the spring base 15 and the pins 13 and 14 of the spring lever arm 11 described above. Attached. That is, the spring 16 is spanned between the pin 18 of the spring base 15 and the pin 13 of the spring lever arm 11, and the spring 17 is spanned between the pin 19 of the spring base 15 and the pin 14 of the spring lever arm 10. It has been. The springs 16 and 17 are locked to the pins 13, 14, 18, and 19 via bearings. Further, the spring unit described above is formed in a symmetrical shape with the axis of the valve stem 5 as the center.

  The two springs 16 and 17 are tension springs, and both cooperate to act so as to rotate the spring lever arm 10 clockwise in FIG. Therefore, a clockwise rotational moment is exerted on the valve stem 5, and this spring force is transmitted to the valve body 3 via the valve stem 5 and the valve body arm, so that the valve body 3 is seated on the valve seat 4. .

  The gland mechanism that prevents pressure water from leaking along the valve stem 5 uses an O-ring to prevent the leak while preventing the valve stem 5 from rotating, and the O-ring has a bearing that supports the rotational motion of the valve stem 5. ing. However, this gland mechanism has a problem that the sealability of the O-ring cannot be maintained for a long time due to uneven wear of the bearing unless there is a processing error of the shaft core on both sides of the valve box and the automatic alignment from the bending of the valve stem itself.

Therefore, in the check valve according to the present invention, as shown in FIG. 4, the valve stem 5 is provided with a gland mechanism having an automatic alignment property and a good sealing property.
In FIG. 4, the gland mechanism of this embodiment is provided with a grant case 30 in the penetrating portion of the valve box 2 of the valve stem 5, and the gland case 30 accommodates a bearing metal part and a seal part inscribed in the outer diameter of the valve stem. Taking up space where you can. In the case of this embodiment, an X-ring consisting of an O-ring case 33 containing O-rings 31 and 32 and an elastic body as a sealing means provided on the side of the valve ring side of the O-ring case 33 is included in the space. 34 and a fluororesin ring 35 made of, for example, Teflon (registered trademark) as a ring member provided on the outer side portion of the O-ring case 33. These parts are set with an appropriate tightening force on a female screw 37 in which the ground retainer 36 is threaded on the inner wall of the ground case 30.

  Among these, the X ring 34 is configured to follow the movement of the valve stem 5 and seal the pressure water from the inner diameter side, and to move and prevent the O-ring case 33 from being worn. In addition, the fluororesin ring 35 has a structure that does not hinder the movement of the O-ring case 33 even when it is in contact with the O-ring case 33. Note that one O-ring may be provided in the O-ring case 33. A V ring may be used instead of the X ring 34.

  The gland mechanism configured as described above is configured so that both side surfaces in the valve shaft axial direction of the O-ring case 33 having a slight gap between the inner wall surface of the ground case 30 are formed by the X ring 34 and the fluororesin ring 35. It is attached with appropriate clamping force. Therefore, the pressure water can be reliably sealed by the O-rings 31 and 32 and the X-ring 34, and can be prevented from uneven wear of the valve stem.

1 is a longitudinal sectional view of a check valve according to the present invention. It is a cross-sectional view of the check valve according to the present invention. It is a front view which shows the spring unit part of the non-return valve of this invention. It is sectional drawing which shows the gland mechanism of the non-return valve of this invention. It is sectional drawing which shows the gland mechanism of the conventional check valve.

Explanation of symbols

1 Check Valve 2 Valve Box 3 Valve Body 4 Valve Seat 5 Valve Rod 16, 17 Spring 30 Ground Case 31, 32 O-ring 33 O-ring Case 34 X-ring 35 Fluororesin Ring

Claims (4)

An urging means for urging at least one end of the valve rod to extend outside the valve casing and energizing the rotating force in the direction in which the valve body is seated on the valve seat with respect to the valve stem outside the valve casing. In the quick check type check valve equipped,
A ground case is provided in a penetrating portion through which the valve stem penetrates the valve box. In the ground case, there is an O-ring in contact with the valve stem, covering the O-ring, and having a gap with an inner peripheral surface of the ground case. An disposed O-ring case, sealing means for sealing the side surface of the O-ring case and the inner side surface of the ground case, and a sliding ring member provided between the O-ring case and the outer side surface of the ground case. A check valve characterized by being provided.   The check valve according to claim 1, wherein the sealing means is an X ring that enhances sealing performance by pressure water.   2. The check valve according to claim 1, wherein the sealing means is a V-ring that enhances sealing performance with pressure water.   2. The check valve according to claim 1, wherein the sliding ring member is a fluorine resin ring.

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