JP4080049B2 - Freezing prevention valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-freezing valve attached to a steam trap that automatically discharges condensate generated in a steam piping system. This anti-freeze valve opens automatically when the operation of the steam piping system is stopped, and prevents water from being inside the steam trap to prevent freeze cracking. .
[0002]
[Prior art]
A conventional anti-freezing valve is disclosed in, for example, Japanese Utility Model Publication No. 63-175371. In this publication, an inflow port and a discharge port are formed at both ends of a valve housing having a valve chamber, a valve seat is formed at the valve chamber side opening end of the discharge port, and the valve seat faces the valve seat. A valve body is arranged in the room, and an elastic means for urging the valve body in the seating direction is provided. The inlet is connected to the bottom of the steam trap and the outlet is connected to the outside of the system. Is done. Since the fluid pressure in the valve chamber connected to the steam trap through the inflow port exerts a force in the seating direction on the valve body, the valve body is seated on the valve seat by the fluid pressure in the valve chamber during operation of the steam piping system. The outlet is closed. When the operation of the steam piping system is stopped and the fluid pressure in the valve chamber is lower than the urging force of the elastic means, the valve body is separated from the valve seat by the elastic means and opens the discharge port.
[0003]
[Problems to be solved by the invention]
Since the condensate discharged from the steam trap still has a considerable amount of heat, the condensate discharged from multiple steam traps is sucked using a condensate recovery pump for effective use of energy. However, condensate recovery systems that are sent to boilers and waste heat utilization devices for effective use are widely used. If the conventional anti-freezing valve is used in this condensate recovery system and there is a steam piping system that has been shut down, air is mixed in from the steam trap attached to the steam piping system, and the condensate recovery pump vacuum is reduced. There was a problem of not standing up. This is because the anti-freeze valve attached to the steam trap of the steam piping system that has been shut down opens the discharge port, so air enters the steam trap through this anti-freeze valve. It is.
[0004]
Therefore, the technical problem of the present invention is that it can be attached to a steam trap used in a condensate recovery system so that the water in the steam trap can be removed outside the system when the operation of the steam piping system is stopped, and the mixing of air can be prevented. It is to provide a freeze prevention valve.
[0005]
[Technical means for solving the problems]
The present invention is characterized by a valve housing that forms a valve chamber having an inlet and an outlet at both ends, a valve seat that forms a valve chamber side opening of the outlet, and a valve seat that faces the valve seat and is disposed in the valve chamber. Valve body, elastic means for urging the valve body in the separating direction, a check valve seat formed between the valve seat and the discharge port, and a reverse valve disposed on the discharge port side facing the check valve seat And a stop valve body, wherein the inlet is connected to the bottom of the steam trap and the outlet is connected to the outside of the system .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The antifreezing valve of the present invention is used with the inlet connected to the bottom of the steam trap and the outlet connected to the outside of the system. Since the fluid pressure in the valve chamber connected to the steam trap through the inflow port exerts a force in the seating direction on the valve body, the valve body is seated on the valve seat by the fluid pressure in the valve chamber during operation of the steam piping system. The outlet is closed. When the operation of the steam piping system is stopped and the fluid pressure in the valve chamber is lower than the urging force of the elastic means, the valve body is separated from the valve seat by the elastic means and opens the discharge port. At this time, the check valve body is separated from the check valve seat by the fluid pressure in the valve chamber and opens the discharge port. As a result, the water inside the steam trap is excluded from the system through the discharge port. Further, when the fluid pressure in the valve chamber is reduced to be lower than the pressure outside the system, the check valve body is seated on the check valve seat and the discharge port is closed.
[0007]
【Example】
A specific embodiment of the freeze prevention valve of the present invention will be described below with reference to FIG. Reference numeral 1 indicates a main body having a threaded portion 2 for connection to a steam trap (not shown) at the front end, and a valve seat member 3 is screwed to the rear end to form a valve housing. In the substantially cylindrical valve chamber 4 formed in the valve housing, an inflow port 5 penetrating the screw portion 2 of the main body 1 and an exhaust port 6 penetrating the valve seat member 3 side are opened. The discharge port 6 is connected to the outside of the system, but a screw for connecting a discharge pipe is provided in case the discharge of the discharged fluid is restricted.
[0008]
An annular valve seat 7 is provided at the valve chamber 4 side opening end of the valve seat member 3. A disc-shaped valve body 8 is disposed in the valve chamber 4 so as to face the valve seat 7, and an elastic means 9 made of a coil spring is disposed between the valve body 8 and the valve seat member 3. The valve body 8 is biased in a direction away from the valve seat 7 by the elastic means 9. On the inlet 5 side of the valve body 8, a partition wall 11 that crosses the valve chamber 4 and has a communication hole 10 in the peripheral portion, and a cylindrical screen 12 are arranged. The partition wall 11 surrounds the valve body 8 and protrudes toward the valve seat member 3, and the tip is in contact with the valve seat member 3. One end of the screen 12 is fitted to the partition wall 11 and the other end is in contact with the taper-shaped inner wall of the main body 1.
[0009]
An annular check valve seat 13 is provided between the valve seat 7 and the discharge port 6. A spherical check valve body 14 is arranged on the discharge port 6 side so as to face the check valve seat 13, and a snap ring 15 for preventing the check valve body 14 from being pulled out is provided.
[0010]
Next, the operation of this embodiment will be described. The inlet 5 is connected to the bottom of the steam trap, and the outlet 6 is connected outside the system. Since the valve body 8 receives the fluid pressure in the valve chamber 4 as a force in the seating direction on the valve seat 7, the valve body 8 is seated on the valve seat 7 by the fluid pressure in the valve chamber 4 during the operation of the steam piping system. 6 is closed.
[0011]
When the operation of the steam piping system is stopped, the fluid pressure in the valve chamber 4 decreases. When the fluid pressure is lower than the urging force of the elastic means 9, the valve body 8 is separated from the valve seat 7 by the elastic means 9 and opens the discharge port 6. At this time, the check valve body 14 is separated from the check valve seat 13 by the fluid pressure in the valve chamber 4 to open the discharge port 6. Thereby, the water inside the steam trap is removed from the discharge port 6 to the outside of the system.
[0012]
Then, when the fluid pressure in the valve chamber 4 is further reduced to be lower than the pressure outside the system, the check valve body 14 is seated on the check valve seat 13 and the discharge port 6 is closed. This prevents air from entering the steam trap.
[0013]
【The invention's effect】
As described above, the anti-freezing valve of the present invention is attached to a steam trap used in a condensate recovery system, and when the operation of the steam piping system is stopped, water in the steam trap can be excluded from the system and air can be removed. Has an excellent effect of preventing contamination.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a freeze prevention valve according to a specific embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 3 Valve seat member 4 Valve chamber 5 Inflow port 6 Outlet port 7 Valve seat 8 Valve body 9 Coil spring 13 Check valve seat 14 Check valve body

Claims (1)

A valve housing that forms a valve chamber having an inlet and an outlet opening at both ends; a valve seat that forms an opening on the valve chamber side of the outlet; a valve body that faces the valve seat and is disposed in the valve chamber; Elastic means for urging the body in the separating direction, a check valve seat formed between the valve seat and the discharge port, and a check valve body arranged on the discharge port side facing the check valve seat, An antifreezing valve comprising an inlet port connected to the bottom of the steam trap and an outlet port connected to the outside of the system .

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