JP5917130B2 - Lever float drain trap - Google Patents

Description

The present invention relates to a lever float drain trap that automatically discharges drain generated in a steam piping system, compressed air piping system, and gas piping system using a float.

The conventional lever float type drain trap has an inlet, a valve chamber, and an outlet formed in a casing, a valve port that communicates the valve chamber and the outlet is formed in the lower portion of the valve chamber, and around a swinging shaft supported in the valve chamber. A floating lever is provided, and a float that rises and falls according to the liquid level in the valve chamber is connected to the lever, and a valve body that opens and closes the valve port is connected to the lever, and rises and falls according to the liquid level in the valve chamber The drain is automatically discharged by rotating the lever with the float and opening and closing the valve port with the valve body.

JP-A-2005-36901

In the conventional lever float type drain trap, when water hammer or the like occurs in the piping system and the pressure or liquid level in the valve chamber fluctuates rapidly, the lever is further closed from the position where the valve body closes the valve port. Rotating in the direction, the float collided with the bottom wall of the valve chamber and was damaged.

The problem to be solved is to provide a lever float drain trap that can prevent float damage.

In order to solve the above-mentioned problems, the lever float drain trap of the present invention forms an inlet, a valve chamber, and an outlet in a casing, and forms a valve port that communicates the valve chamber with the outlet at a lower portion of the valve chamber. Provided with a lever that rotates around a rocking shaft supported in the chamber, connected to the lever a float that rises and falls according to the liquid level in the valve chamber, and a valve body that opens and closes the valve port to the lever, A stopper member that contacts the float when the lever further rotates in the valve closing direction from the position where the valve body closes the valve opening is provided below the float, and the stopper member is formed by a coil spring.

According to the present invention, the stopper member with which the float comes into contact when the lever further rotates in the valve closing direction from the position where the valve body closes the valve port is provided below the float, and the stopper member is formed by the coil spring. Therefore, it is possible to prevent the float from colliding with the bottom wall of the valve chamber by absorbing the impact of the float with the stopper member made of a coil spring, and to prevent the float, the joint between the float and the lever, and the lever from being damaged. .

It is sectional drawing of the lever float type drain trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A lid 4 is fastened to a main body 3 having an inlet 1 and an outlet 2 with a bolt 5 to constitute a casing having a valve chamber 6 therein. A valve seat member 9 having a first valve port 7 and a second valve port 8 communicating with the valve chamber 6 and the outlet 2 is attached to a main body 3 below the valve chamber 6 with a screw (not shown). The inlet 1 opens to the lower part of the valve chamber 6, and the outlet 2 opens to the lower part of the valve chamber 6 through the first valve port 7 and the second valve port 8. A swing shaft 10 is supported by a valve seat member 9 in the valve chamber 6, and a right side portion of a lever 11 is rotatably connected to the swing shaft 10. A hollow spherical float 12 that rises and falls according to the liquid level in the valve chamber 6 is connected to the left end of the lever 11. A connecting shaft 13 parallel to the swing shaft 10 is supported on the right end portion of the lever 11, and the upper portion of the connecting rod 14 is rotatably connected to the connecting shaft 13. The lower portion of the connecting rod 14 is rotatably connected to a valve shaft 17 parallel to the swing shaft 10 supported on the upper end portion of the valve rod 16 of the valve body 15.

The valve body 15 includes a first valve body 18 that opens and closes the first valve port 7 from the lower outlet 2 side, a second valve body 19 that opens and closes the second valve port 8 from the lower valve chamber 6 side, and a first valve It comprises a valve rod 16 connecting the body 18 and the second valve body 19. When the lever 11 is further rotated in the valve closing direction from the position where the first valve body 18 and the second valve body 19 close the first valve port 7 and the second valve port 8, the stopper member 20 is brought into contact with the float 12. Provided below. The stopper member 20 is composed of a conical coil spring whose coil radius increases upward, and the lower end is fixed to the bottom wall of the main body 3 by an attachment member 22 fixed to the bottom wall of the main body 3 by bolts 21.

When the liquid level in the valve chamber 6 is low, the float 12 descends as shown in FIG. 1, and the first valve body 18 and the second valve body 19 close the first valve port 7 and the second valve port 8. Yes. At this time, the float 12 is not in contact with the stopper member 20. When a water hammer or the like is generated in the piping system and the pressure or liquid level in the valve chamber 6 is suddenly changed and the lever 11 further rotates in the valve closing direction, the float 12 comes into contact with the stopper member 20 formed of a conical coil spring. The stopper member 20 absorbs the impact of the float 12 and prevents the float 12 from colliding with the bottom wall of the valve chamber, and prevents the float 12 and the connecting portion between the float 12 and the lever 11 and the lever 11 from being damaged. When the liquid level in the valve chamber 6 rises due to the drain flowing from the inlet 1, the float 12 moves up, and the lever 11 rotates around the swing shaft 10 in the clockwise direction. By the rotation of the lever 11, the valve body 15 moves downward via the connecting rod 14, and the first valve body 18 and the second valve body 19 open the first valve port 7 and the second valve port 8. Thereby, the drain of the valve chamber 6 is discharged from the outlet 2. When the liquid level in the valve chamber 6 decreases due to the drainage, the float 12 moves downward and the lever 11 rotates counterclockwise about the swing shaft 10. Due to the rotation of the lever 11, the valve body 15 moves upward via the connecting rod 14, and the first valve body 18 and the second valve body 19 close the first valve port 7 and the second valve port 8. This prevents gas leakage.

INDUSTRIAL APPLICABILITY The present invention can be used for a lever float drain trap that automatically discharges drain generated in a steam piping system, compressed air piping system, or gas piping system using a float.

1 Inlet 2 Outlet 3 Body 4 Lid 6 Valve Chamber 7 First Valve Port 8 Second Valve Port 10 Oscillating Shaft 11 Lever 12 Float 15 Valve Element 18 First Valve Element 19 Second Valve Element 20 Stopper Member

Claims (1)

The casing forms an inlet, a valve chamber, and an outlet. A valve port that communicates the valve chamber and the outlet is formed in the lower portion of the valve chamber. A lever that rotates around a swing shaft supported in the valve chamber is provided. When the float that rises and falls according to the liquid level is connected to the lever and the valve body that opens and closes the valve port is connected to the lever, the float does not come into contact with the valve when the valve body closes the valve port. A lever float type drain trap characterized in that a stopper member that contacts the float when the lever further rotates in the valve closing direction from the position where the mouth is closed is provided below the float, and the stopper member is formed by a coil spring.

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