JP2011074941A - Swing type check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swing type check valve having a regulating function and facilitating maintenance. <P>SOLUTION: The swing type check valve included a valve box 1 having an opening part 7 formed thereon, a valve cover 8 detachably disposed on the valve box 1 and covering the opening part 7, and a valve element 5 capable of rotating through a valve shaft 4 supported on the valve box 1. The check valve opens and closes a channel passing through an inside of the valve box 1 by turning between a close position where the valve element 5 is seated on a valve seat 6 and an open position where the valve element separates from the valve seat. The check valve includes a stopper 10 abutting on a back surface at an opposite side of a surface of the valve seat 6 on which the valve element 5 is seated. The stopper 10 is movably installed on the valve cover 8, and opening of the valve element 5 is changed by movement of the stopper 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a swing type check valve having a function of a sluice valve.

  In general, on the discharge side of a centrifugal pump or the like, a check valve for preventing a back flow from the piping system when the pump is stopped and a sluice valve for pressing the pump so that the flow rate of the pump does not come out as standard are equipped. However, the installation conditions of the centrifugal pump and the like are various, and the space on the discharge side is small, and there are many cases where there is no room for installing the check valve and the sluice valve.

  By the way, what provided the stopper which controls the opening degree of a valve body in the swing type check valve is known. Further, Patent Document 1 describes a check valve in which a stopper is attached to a valve box so as to be adjustable and the opening degree of the valve body can be adjusted by moving the stopper back and forth. In the check valve of Patent Document 1, an adjustable movable stopper is provided to prevent chattering that occurs when the flow rate is lower than the original design condition, and the opening of the valve from a certain degree of opening to full opening. It is configured so that it can be adjusted.

  In such check valves, maintenance is performed as appropriate, such as replacement of a rubber sheet or the like provided at a contact portion of a valve body or a valve seat, cleaning of the inside, and the like. In such maintenance, removing the entire valve from the piping requires a large amount of work, so it is advantageous to open the valve lid and take out the valve element. However, in the check valve of Patent Document 1, the stopper is obstructive and it is difficult to take out the valve body. Further, since the stopper itself cannot be taken out from the valve box, there is a problem that it is difficult to remove even if there is a foreign matter that has entered the stopper, for example.

JP 2002-005318 A

  An object of the present invention is to provide a swing type check valve that solves the above-described conventional problems and has a water control function and can be easily maintained.

  In order to solve the above-described problems, the present invention includes a valve box having an opening, a valve lid that is detachably provided in the valve box and covers the opening, and a valve shaft supported by the valve box. And a flow path that passes through the valve box by rotating between a closed position where the valve body is seated on the valve seat and an open position where the valve body is separated from the valve seat. In the swing type check valve that opens and closes, there is provided stopper means that comes into contact with the back surface of the valve body opposite to the surface seated on the valve seat, and the stopper means is movably attached to the valve lid, A swing type check valve is proposed in which the opening degree of the valve body is changed by movement of the stopper means.

  The present invention includes a spindle on which the stopper means is movably supported by the valve lid, and a stopper member attached to a tip of the spindle that has entered the valve box. It is advantageous to abut against the back side of the body.

  Further, according to the present invention, it is advantageous that a rib that extends in the moving direction of the stopper member and abuts against the stopper member is formed on the back surface of the valve body.

Still further, according to the present invention, it is advantageous that the stopper member is mounted on the spindle so as to be rotatable about the axis of the spindle.
Furthermore, it is advantageous if the stopper member is formed in a size that can pass through the opening.

  According to the present invention, since the check valve is provided with a water control function, not only cost reduction but also space saving can be obtained, and maintenance of the valve can be performed without any trouble.

It is a longitudinal cross-sectional view of the check valve according to the present invention. It is sectional drawing according to the II-II line of FIG. It is explanatory drawing which shows a stop member and a spindle. It is explanatory drawing which shows a torii member.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
FIG. 1 is a sectional front view showing a swing type check valve according to the present invention, and FIG. 2 is a sectional side view thereof.

  1 and 2, reference numeral 1 is a valve box 1 of a swing type check valve made of cast iron, stainless steel casting or the like, and water inlets 2 and 3 are formed on the left and right parts of the valve box 1. Yes. In the valve box 1, there is a valve rod 4 extending in the horizontal direction, and a valve body 5 is attached and fixed to the valve rod 4 so that the left side of the figure is seated on the valve seat 6.

  The valve box 1 is formed with an opening 7 formed in a size large enough to take out the valve body 5 and the like, and the opening 7 is normally closed by a valve lid 8. This valve lid 8 is provided with a bypass valve 9 (only its handle is shown) for dropping the upstream water and a stopper means 10 for regulating the opening degree of the valve body 5. Since the bypass valve 9 is not the gist of the present invention, its detailed description is omitted.

  As shown in FIGS. 1 to 3, the stopper means 10 has a spindle 11 that penetrates the valve lid 8 and the lower side enters the valve box 1, and a block-like shape extending horizontally in the lower end of the spindle 11. The stopper member 15 is attached. Further, in the case of the present embodiment, a thread groove 12 is formed at the upper part of the spindle 11, and a handle 13 is fixed to the tip thereof. The screw groove 12 of the spindle 11 is screwed into a screw hole 14a of a torii member 14 (shown in FIG. 4) erected on the valve lid 8, so that the spindle 11 rotates in the axial direction by rotating the handle 13, that is, the valve It is moved in a direction penetrating the box 1 from above. The stopper member 15 is rotatably fitted to a small-diameter portion formed at the lower portion of the spindle 11 and is prevented from dropping by a stop ring 17 attached by a set screw 16.

  The stopper means 10 configured as described above is arranged so that the stopper member 15 contacts the surface opposite to the surface of the valve body 5 on which the valve seat 6 is seated. And the two ribs 20 extended in the up-down direction which is the moving direction of the stopper member 15 are formed in the contact surface of the stopper member 15 of the valve body 5, and the space | interval W of this rib 20 is shown in FIG. The stopper member 15 is shorter than the longitudinal width H of the stopper member 15 and is set so that the stopper member 15 always abuts against the rib 20. In addition, although it is advantageous to form two ribs 20, the number of ribs is not limited to two and may be three or more, or even one.

  The check valve configured as described above also has a function as a sluice valve that adjusts the opening of the valve at a position where the stop member 15 of the stop means 10 contacts the valve body 5. Therefore, the sluice valve can be omitted in the pump facility, and not only the machine parts can be saved, but also the installation space can be reduced. At this time, the stopper member 15 moves in the vertical direction of FIG. 1 while being in contact with the rib 20, so that the valve opening degree of the valve body 5 is predetermined from the closed position where it is seated on the valve seat 6. An arbitrary angle up to (approximately 60 °) can be set.

  Further, since the stop member 15 contacts the valve body 5 through the rib 20 in the check valve of this embodiment, the contact area is small and the resistance is small, so that the operation of the stop means 10 can be performed smoothly. Furthermore, since the stop member 15 is rotatably mounted on the spindle 11, it can hit the two ribs 20 almost equally and move smoothly.

  In the check valve of the above embodiment, one end of the valve stem 4 extends to the outside of the valve box 1, and the valve body 5 is seated on the valve seat 6 with respect to the valve stem 4 outside the valve box 1. A biasing means 21 for biasing the rotational force is provided. At this time, a gland case 22 is provided in a penetrating portion through which the valve stem 4 penetrates the valve box 1, and sealing means such as an O-ring in contact with the valve stem 4 is provided in the gland case 22.

  Such a seal structure is also provided in a penetrating portion through which the spindle 11 penetrates the valve lid 8, that is, a ground case 22 having any configuration is provided also in the penetrating portion of the valve lid 8. In this embodiment, if the valve rod 4 and the spindle 11 in the penetrating portion have the same diameter, the parts of the seal portion can be used in common.

  Further, the stopper means 10 of the above embodiment moves the stop member 15 by an external screw method, but the present invention can also adopt an internal screw method in which the torii is stopped and the screw portion is placed inside the ground seal. Yes, it can be used for fresh water without foreign matter.

DESCRIPTION OF SYMBOLS 1 Valve box 4 Valve stick 5 Valve body 6 Valve seat 7 Opening part 8 Valve cover 10 Stopper means 11 Spindle 15 Stopper member

Claims (5)

A valve box having an opening, a valve lid that is detachably provided on the valve box and covers the opening, and a valve body that is rotatable via a valve shaft supported by the valve box. In the swing type check valve that opens and closes the flow path passing through the valve box by rotating between a closed position where the valve body is seated on the valve seat and an open position where the valve body is separated from the valve seat,
Stopper means that contacts the back surface of the valve body opposite to the surface seated on the valve seat is provided. The stopper means is movably mounted on the valve lid, and the valve body is opened by movement of the stopper means. Swing type check valve characterized in that the degree is changed.   The swing-type check valve according to claim 1, wherein the stopper means includes a spindle movably supported by the valve lid, and a stopper member attached to a tip of the spindle that has entered the valve box. A swing type check valve, wherein the stopper portion abuts against the back surface of the valve body.   The swing type check valve according to claim 1 or 2, wherein a rib is formed on the back surface of the valve body so as to extend in a moving direction of the stopper member and contact the stopper member. Check valve.   4. The swing type check valve according to claim 2, wherein the stopper member is mounted on the spindle so as to be rotatable about an axis of the spindle.   The swing type check valve according to any one of claims 2 to 4, wherein the stopper member is formed in a size that can pass through the opening.

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