JP2011163548A - Lever float type drain trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lever float type drain trap capable of setting off fluid pressure acting on a valve element, without leaking gas, to open and close a large valve port. <P>SOLUTION: This drain trap is provided with a lever 16 rotating around a swinging shaft 15 supported in a valve chest 6, a float 17 floating up and down in response to a liquid level in the valve chest 6 is connected to the lever 16, and the valve element 12 is connected to the lever 16, to open and close the valve port 9 by seating and separation onto/from a valve seat 7. The valve seat 7 is cylindrical-shaped, both end thereof is opened to the valve chest 6, and the periphery thereof is communicated with an outlet 2 by a discharge hole 8. The valve element 12 is cylindrical-shaped, one end thereof is opened, and the other end is closed by a wall member 13, to open and close the valve port 9 in a one-end opening side of the valve seat 7 by an annular valve face 14 in the one-end opening side and to make an outer circumference in a wall member 13 side of the other end slide airtightly on a sliding part 10 of an inner circumference in the other side opening side of the valve seat 7. A peripheral wall 24 of the valve element 12 includes an orifice 23 formed in an opening area where drain generated at the time of blow in a piping system is not discharged completely. <P>COPYRIGHT: (C)2011,JPO&INPIT

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.

  A conventional lever float drain trap is formed in a casing, which forms an inlet, a valve chamber, and an outlet. A valve seat that opens a valve port that communicates the valve chamber and the outlet is formed in the lower portion of the valve chamber, and is supported in the valve chamber. A lever that rotates around the swing shaft is connected to a float that rises and falls according to the liquid level in the valve chamber, and a valve element that opens and closes the valve seat and opens and closes the valve port is connected to the lever. The first and second valve seats provided on one axis form a valve seat, and the first and second valve seats are simultaneously opened and closed by moving on the first and second valve seat axes. A valve body is formed by the first and second valve bodies, and the fluid pressure acting on the valve body is made to act symmetrically to cancel each other so that a large valve port can be opened and closed.

JP 2008-286238 A

The conventional lever float type drain trap has a problem that it is difficult to manufacture the first and second valve bodies so that they can be seated on the first and second valve seats at the same time, and gas is likely to leak. .

Therefore, the problem to be solved by the present invention is to provide a lever float type drain trap capable of opening and closing a large valve port by offsetting the fluid pressure acting on the valve body without leaking gas.

In order to solve the above-mentioned problems, the lever float type drain trap of the present invention has an inlet, a valve chamber, and an outlet formed in a casing, and a valve seat that opens a valve port that communicates the valve chamber and the outlet. And a lever that rotates around a swing shaft supported in the valve chamber is provided, and a float that rises and falls according to the liquid level in the valve chamber is connected to the lever and seated on the valve seat to open the valve port. In the valve body that opens and closes connected to the lever, the valve seat has a cylindrical shape and both ends open to the valve chamber and the periphery communicates with the outlet through the discharge hole. The valve body has a cylindrical shape that opens at one end and the other end at the other end. The annular valve face on one end opening side opens and closes the valve opening on one end opening side of the valve seat, and the outer periphery on the other end wall member side airtightly slides on the inner periphery on the other end opening side of the valve seat. The surrounding wall of the valve body discharges the drain that is generated when the piping system supplies air. It is characterized in that the one having an orifice formed in the opening area is not expired.

According to the present invention, the valve seat has a cylindrical shape and both ends open to the valve chamber and the periphery communicates with the outlet through the discharge hole. The valve body has a cylindrical shape and has one end opened and the other end closed by the wall member. The annular valve surface on the opening side opens and closes the valve opening on the one end opening side of the valve seat, and the outer periphery on the other end wall member side airtightly slides on the inner periphery on the other end opening side of the valve seat. Since the peripheral wall of the body has an orifice formed in an opening area that cannot exhaust the drain generated when air is supplied to the piping system, it acts on one end of the valve body or one surface of the wall member and the other surface of the wall member. The effect is that the fluid pressures acting on each other cancel each other and can be opened and closed without leaking gas through the valve face of the valve body without leaking gas.

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. The lever float type drain trap constitutes a casing having a valve chamber 6 inside by fastening a lid 4 with a bolt 5 to a main body 3 having an inlet 1 and an outlet 2. A valve seat 7 is attached to the main body 3 below the valve chamber 6 with screws (not shown). The valve seat 7 has a cylindrical shape and both ends open to the valve chamber 6 and communicates with the outlet 2 through the discharge hole 8 at the periphery. A valve port 9 communicating with the valve chamber 6 and the outlet 2 is formed by one end opening side of the valve seat 7, and a sliding portion 10 is formed by the inner periphery of the other end opening side. An airtight O-ring 11 is disposed on the sliding portion 10. 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 valve port 9 and the discharge hole 8.

A valve body 12 that opens and closes on the valve seat 7 to open and close the valve port 9 is disposed in the valve seat 7. The valve body 12 is formed in a cylindrical shape by opening one end and closing the other end with a wall member 13. In the valve body 12, the annular valve surface 14 on the one end opening side opens and closes the valve port 9 on the one end opening side of the valve seat 7, and the outer periphery on the wall member 13 side on the other end is the inner periphery on the other end opening side of the valve seat 7. The sliding portion 10 is slid in an airtight manner. The valve body 12 has an orifice 23 formed in the peripheral wall 24 in an opening area where drainage generated when air is supplied to the piping system cannot be discharged.

A swing shaft 15 is supported in the valve chamber 6 of the lid 4, and the right end portion of the lever 16 is rotatably connected to the swing shaft 15. A hollow spherical float 17 that rises and falls according to the liquid level in the valve chamber 6 is connected to the left end of the lever 16. A connecting shaft 18 parallel to the swing shaft 15 is supported on the right side of the lever 16, and the upper portion of the connecting rod 19 is rotatably connected to the connecting shaft 18. The lower portion of the connecting rod 19 is rotatably connected to a valve shaft 21 parallel to the swing shaft 15 supported on the upper end portion of the valve rod 20 of the valve body 12. The valve rod 20 is guided up and down by the guide portion 22 of the lid 4.

The operation of the lever float type drain trap is as follows. When the liquid level in the valve chamber 6 is low, the float 17 is lowered as shown in FIG. 1, and the valve body 12 closes the valve port 9. At this time, the drain of the valve chamber 6 is discharged from the orifice 23 through the discharge hole 8 to the outlet 2. When the amount of drain flowing from the inlet 1 increases and the liquid level in the valve chamber 6 rises, the float 17 moves upward and the lever 16 rotates clockwise about the swing shaft 15. The rotation of the lever 16 causes the valve body 12 to move upward through the connecting rod 19 to open the valve port 9. Thereby, the drain of the valve chamber 6 is discharged from the valve port 9 to the outlet 2 through the discharge hole 8.

When the liquid level in the valve chamber 6 is lowered due to the drainage, the float 17 moves downward and the lever 16 rotates counterclockwise about the swing shaft 15. Due to the rotation of the lever 16, the valve body 12 moves downward through the connecting rod 19 to close the valve port 9. This prevents gas leakage. By causing the fluid pressure acting from below and above the valve body 12 to act symmetrically and cancel each other, the large valve port 9 can be opened and closed by the valve body 12 without leaking gas.

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.

DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 4 Cover body 6 Valve chamber 7 Valve seat 8 Discharge hole 9 Valve port 10 Sliding part 11 O-ring 12 Valve body 13 Wall member 14 Annular valve surface 15 Oscillating shaft 16 Lever 17 Float 20 Valve rod 23 Orifice 24 Surrounding wall

Claims (1)

A casing that forms an inlet, a valve chamber, and an outlet with a casing, a valve seat that opens a valve port that connects the valve chamber and the outlet is formed at the bottom of the valve chamber, and a lever that rotates around a swing shaft supported in the valve chamber The float that rises and falls according to the liquid level in the valve chamber is connected to the lever, and the valve body that opens and closes the valve seat and opens and closes the valve port is connected to the lever. The valve body has a cylindrical shape and is open at one end and is closed at the other end by a wall member, and the annular valve surface at the one end opening side is at one end opening side of the valve seat The outer periphery on the other end wall member side slides airtightly on the inner periphery on the other end opening side of the valve seat, and the peripheral wall of the valve element is generated when air is supplied to the piping system. It is characterized by having an orifice formed in an opening area that cannot drain the drain. That lever float type drain trap.

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