JP4648079B2 - Exhaust valve - Google Patents

Description

  The present invention is a float valve that opens and closes a valve port by floating up and down of the float, such as a steam trap that automatically discharges only condensate from various steam-using devices and steam pipes, and an air that discharges only condensate from the air pipe. The present invention relates to an air vent that discharges noncondensable gas from a trap or a liquid pipe.

  The basic configuration of the float valve is shown in, for example, Japanese Patent Publication No. 59-32718. The float valve disclosed here is a free float trap, and as is understood from the publication, a pair of inlets and outlets are formed in a valve casing having a valve chamber therein, and a partition member between the valve chamber and the outlet is formed. Is provided with a valve port for communicating the both, and the valve port is opened and closed by a float housed in the valve chamber.

The opening force in the float valve is determined from the valve area and the differential pressure between the inlet and outlet. If the valve opening force due to the float buoyancy is the same, if the pressure difference between the inlet and outlet is small, the valve can be opened even if the valve area is large, but if the pressure difference is large, the valve cannot be opened. There was a problem.
Japanese Patent Publication No.59-32718

  The problem to be solved is a float valve that can open a valve opening with a large opening area when the differential pressure at the inlet and outlet is small, and can open a valve opening with a small opening area when the differential pressure between the inlet and outlet is large. Is to provide.

  A float valve according to the present invention includes a valve casing having first and second openings serving as inlets or outlets, and a valve chamber formed between the two openings, and a first partition that partitions the first opening and the valve chamber. A member, a second partition member separating the second opening and the valve chamber, a first inlet and a first valve port formed in the first partition member, a second inlet and a second inlet formed in the second partition member A first valve that allows a fluid to flow from the first opening to the valve chamber through the first inlet and prohibits an outflow from the valve chamber to the first opening; A valve body, a second check valve body that allows the flow of fluid from the second opening to the valve chamber through the second inlet and prohibits the flow from the valve chamber to the second opening, and is accommodated in the valve chamber. And a float that opens and closes the first or second valve port.

  In the present invention, by connecting the inlet and the outlet in reverse according to the pressure difference between the inlet and the outlet, when the pressure difference between the inlet and the outlet is small, a valve opening having a large opening area can be opened. When the pressure is large, an excellent effect is obtained that a valve opening with a small opening area can be opened.

  When the differential pressure between the inlet and the outlet is large, the float valve of the present invention is piped with the first opening as the inlet and the second opening as the outlet. The first inlet is opened by the first check valve body, and the second inlet is closed by the second check valve body. The float rises and falls by the fluid flowing in from the first inflow port, and opens and closes the second valve port having a smaller opening area than the first valve port. Therefore, when the pressure difference between the inlet and the outlet is large, the second valve port with a small opening area can be opened. On the other hand, when the differential pressure between the inlet and outlet is small, piping is performed with the second opening as the inlet and the first opening as the outlet. The second inlet is opened by the second check valve body, and the first inlet is closed by the first check valve body. The float rises and falls by the fluid flowing in from the second inflow port, and opens and closes the first valve port having a larger opening area than the second valve port. Therefore, when the differential pressure between the inlet and the outlet is small, the first valve port having a large opening area can be opened.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). In this embodiment, a specific example used for a free float air trap will be described. A first opening 2 serving as an inlet or outlet is formed at one end of the valve casing 1, a second opening 3 serving as an inlet or outlet is formed at the other end, and a valve chamber 4 is formed between both the openings 2 and 3. . A first partition member 5 is fixed to the end of the first opening 2 on the valve chamber 4 side by a snap ring 6, and the first opening 2 and the valve chamber 4 are partitioned. Further, the second partition member 7 is fixed to the end of the second opening 3 on the valve chamber 4 side by a snap ring 8 so that the valve chamber 4 and the second opening 3 are partitioned.

  A through hole 9 is formed at the center of the first partition member 5, and a plurality of first inflow ports 10 are formed around the through hole 9. A first check valve body 12 is opened at the center, and a first check valve body 12 that opens and closes the first inlet 10 at the umbrella portion is fixed to the through hole 9. A through hole 13 is formed in the center of the second partition member 7, and a plurality of second inflow ports 14 are formed around the through hole 13. A second valve port 15 is opened at the center, and a second check valve body 16 that opens and closes the second inlet 14 at the umbrella portion is fixed to the through hole 13. The opening area of the second valve port 15 is formed smaller than the opening area of the first valve port 11. A spherical float 17 is accommodated in the valve chamber 4 in a free state. Reference numeral 18 is a plurality of ribs formed in the main body 1 for guiding the float 17 in the direction of the first and second valve ports 11 and 15, and reference numerals 19 and 20 are for connecting the pipes. It is a female screw formed in the main body 1.

  When the differential pressure between the inlet and the outlet is large, piping is performed with the first opening 2 as the inlet and the second opening 3 as the outlet. The first inlet 10 is opened by a first check valve body 12, and the second inlet 14 is closed by a second check valve body 16. When the liquid level in the valve chamber 4 rises due to drain flowing from the first inlet 10, the float 17 rises, opens the second valve port 15 having a small opening area, discharges the drain, and discharges the drain. When the liquid level in the valve chamber 4 is lowered, the float 17 is lowered and the second valve port 15 is closed. When a reverse flow occurs from the second opening 3 side, the first check valve body 12 closes the first inflow port 10 and the float 17 closes the first valve port 11 to prevent the reverse flow.

  On the other hand, when the pressure difference between the inlet and the outlet is small, the valve casing 1 is turned upside down from the illustrated state, and the second opening 3 is used as the inlet and the first opening 2 is used as the outlet. The second inlet 14 is opened by a second check valve body 16, and the first inlet 10 is closed by a first check valve body 12. When the liquid level in the valve chamber 4 rises due to the drain flowing from the second inlet 14, the float 17 rises, opens the first valve port 11 having a large opening area, discharges the drain, and discharges the drain. When the liquid level in the valve chamber 4 is lowered, the float 17 is lowered to close the first valve port 11. When a reverse flow occurs from the first opening 2 side, the second check valve body 16 closes the first inlet 14 and the float 17 closes the second valve port 15 to prevent the reverse flow.

Sectional drawing of the free-float type air trap of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve casing 2 1st opening 3 2nd opening 4 Valve chamber 5 1st partition member 7 2nd partition member 10 1st inflow port 11 1st valve port 12 1st check valve body 14 2nd inflow port 15 2nd valve Port 16 Second check valve body 17 Float

Claims (1)

A valve casing having first and second openings serving as inlets or outlets and having a valve chamber formed between the two openings; a first partition member that partitions the first opening and the valve chamber; and a second opening The second partition member partitioning the valve chambers, the first inlet and the first valve port formed in the first partition member, and the opening area than the second inlet and the first valve port formed in the second partition member A second check valve body for allowing fluid to flow from the first opening to the valve chamber through the first inflow port and prohibiting outflow from the valve chamber to the first opening; A second check valve body that allows fluid to flow from the second opening to the valve chamber through the inflow port and prohibits outflow from the valve chamber to the second opening; and a first or second valve port housed in the valve chamber And a float valve for opening and closing the valve.

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