JP5367595B2 - Vacuum break valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum breaking valve allowing adjustment of a valve opening lift without removing a valve casing from a fluid piping system. <P>SOLUTION: The valve casing is formed of a body 1 having an inflow port 6 connected to the fluid piping system, and an atmosphere port 4 opened to the atmosphere; and a lid member 2. A valve chamber 3 with which the inflow port 6 and the atmosphere port 4 are in communication is formed in the valve casing. An annular valve seat 5 is provided between the atmosphere port 4 and the valve chamber 3, and a valve element 7 for opening/closing the annular valve seat 5 is arranged in the valve chamber 3. The valve element 7 normally closes the annular valve seat 5, and when the inflow port 6 side is put in a vacuum state, the valve element 7 opens the annular valve seat 5. Both faces of the valve element 7 are protrusively provided with an inlet side valve stem 8 and an outlet side valve stem 9, and both sides of the valve element 7 are provided with an inlet side guide member 12 with which the outer periphery of the inlet side valve stem 8 comes in sliding contact, and an outlet side guide member 14 with which the outer periphery of the outlet side valve stem 9 comes in sliding contact. A stopper member 15 is arranged in an advance/retreat operable manner penetrating the lid member 2 airtightly, and the stopper member 15 is screw-advanced/retreated to adjust a distance to the outlet side valve stem 9. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a vacuum breaker valve that is connected to a fluid piping system such as a fluid piping or a fluid device and introduces the atmosphere to break the vacuum state when the fluid piping system is in a vacuum state.

A conventional vacuum break valve is disclosed in Patent Document 1, for example. This is because a valve chamber is formed in a valve casing having an inlet connected to a fluid piping system and an atmosphere opening opened to the atmosphere, and the inlet and the atmosphere are communicated with each other, and an annular valve is formed between the atmosphere opening and the valve chamber. A valve body that opens and closes the annular valve seat is provided in the valve chamber. Normally, the valve body closes the annular valve seat and the valve body opens the annular valve seat when the inlet side is in a vacuum state. In the case where the valve rod protrudes from both sides of the valve body, and the guide member on which the outer periphery of the valve rod is slidably contacted on both sides of the valve body, the stopper member is screwed to the valve rod and the guide member is connected. The distance can be adjusted.

JP2008-121875A

In the above conventional vacuum break valve, the valve opening lift of the valve body can be adjusted by adjusting the distance between the stopper member and the guide member, so that the amount of air introduced from the air inlet to the inlet can be adjusted. However, in order to adjust the distance between the stopper member and the guide member, there is a problem in that the valve casing must be removed from the fluid piping system.

Therefore, the problem to be solved by the present invention is to provide a vacuum breaker valve that can adjust the valve opening lift without removing the valve casing from the fluid piping system.

In order to solve the above-described problems, a vacuum breaker valve according to the present invention includes a valve chamber in which an inlet and an atmosphere port communicate with each other in a valve casing having an inlet connected to a fluid piping system and an atmosphere opening opened to the atmosphere. An annular valve seat is provided between the air inlet and the valve chamber, and a valve body that opens and closes the annular valve seat is disposed in the valve chamber. Normally, the valve body closes the annular valve seat and the inlet side is in a vacuum state. When the valve body opens the annular valve seat, the valve body protrudes on both sides of the valve body, and the guide body on which the outer periphery of the valve body slides on both sides of the valve body, A stopper member is disposed so as to penetrate the valve casing in an airtight manner so that the screw can be advanced and retracted, and the stopper member can be advanced and retracted to adjust the distance from the valve stem.

According to the present invention, the stopper member is disposed so as to penetrate the valve casing in an airtight manner so that the screw can be advanced and retracted, and the stopper member is screwed forward and backward so that the distance from the valve stem can be adjusted. If the distance to the valve stem is shortened, the valve opening lift of the valve body can be reduced, and if the distance from the valve stem is increased by unscrewing the stopper member, the valve opening lift of the valve body can be increased.

It is sectional drawing of the vacuum breaker valve concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A valve casing is constituted by the main body 1 and the lid member 2, and a valve chamber 3 is formed in the valve casing. The main body 1 is formed with an atmosphere port 4 opened to the atmosphere, an annular valve seat 5 provided at the opening end of the atmosphere port 4 on the valve chamber 3 side, and an inlet 6 connected to the fluid piping system. A valve element 7 that opens and closes the annular valve seat 5 by opening and closing the annular valve seat 5 is disposed in the valve chamber 3 so as to face the annular valve seat 5. The valve body 7 integrally has an inlet side valve rod 8 provided so as to protrude from the lower surface and an outlet side valve rod 9 provided so as to protrude from the upper surface. Two ribs 10 and 11 projecting from the inner wall of the annular valve seat 5 into the valve chamber 3 are formed integrally with the valve casing 1. An inlet side guide member 12 having a guide hole through which the outer periphery of the inlet side valve stem 8 slides is formed integrally with the inner ends of the ribs 10 and 11. The center of the valve body 6 is curved upward to form a recess 13 that accommodates the ribs 9 and 10 protruding into the valve chamber 3 and the inlet side guide member 12 when the valve is closed.

An outlet side guide member 14 having a guide hole through which the outer periphery of the outlet side valve stem 9 slides is integrally formed on the lid member 2. The stopper member 15 is screwed so as to be able to advance and retract the screw from the outside through the lid member 2. An O-ring 16 is arranged on the stopper member 15 to keep airtightness between the lid member 2 and the stopper member 15. If the stopper member 15 is screwed to shorten the distance to the outlet side valve stem 9, the valve opening lift of the valve body 7 can be reduced, and if the stopper member 15 is unscrewed to increase the distance from the outlet side valve stem 9, the valve body 7 The valve opening lift can be increased.

In the state shown in the drawing, the pressure on the inlet 6 side is always higher than the pressure on the atmosphere port 4, and the valve element 7 is seated on the annular valve seat 5 and closed. When the inflow port 6 side is in a vacuum state and becomes smaller than the pressure of the atmosphere port 4, the valve body 7 is separated from the annular valve seat 5 and opened. Thereby, air | atmosphere is introduce | transduced from the air inlet 4 to the inflow port 6 side, and a vacuum state is destroyed.

If the stopper member 15 is screwed to shorten the distance to the outlet side valve stem 9, the valve opening lift of the valve body 7 can be reduced, and if the stopper member 15 is unscrewed to increase the distance from the outlet side valve stem 9, the valve body 7 Since the valve opening lift can be increased, the valve opening lift can be adjusted without removing the main body 1 and the lid member 2 from the fluid piping system.

INDUSTRIAL APPLICABILITY The present invention can be used for a vacuum breaking valve that is connected to a fluid piping system such as a fluid piping or a fluid device and introduces the atmosphere when the fluid piping system is in a vacuum state to break the vacuum state.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid member 3 Valve chamber 4 Atmospheric port 5 Annular valve seat 6 Inlet 7 Valve body 8 Inlet side valve rod 9 Outlet side valve rod 12 Inlet side guide member 14 Outlet side guide member 15 Stopper member 16 O-ring

Claims (1)

A valve chamber is formed in the valve casing having an inlet connected to the fluid piping system and an atmosphere opening opened to the atmosphere, and an annular valve seat is provided between the atmosphere opening and the valve chamber. The valve body that opens and closes the annular valve seat is disposed in the valve chamber, and the valve body normally closes the annular valve seat and the valve body opens the annular valve seat when the inlet side is in a vacuum state. A valve member is provided on both sides of the valve body, and a guide member is provided on both sides of the valve body. A vacuum breaker valve characterized in that it is arranged and the distance between the stopper member and the valve stem can be adjusted by moving the stopper member forward and backward.

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