JPH02300600A - Pilot type steam trap - Google Patents

Abstract

PURPOSE:To prevent steam-leak and to repair the title trap in an early stage by providing a first orifice opened and closed by a pilot-float at the inlet side of a pressure chamber, and providing a float which can be inspected through a glass window in a communicating passage which is opened by a pressure response valve located below the first orifice. CONSTITUTION:A condensed water chamber 6 and a pressure response valve housing chamber 8 are formed by a main body 1 and lid members 2, 3. A pilot float 10 closes a valve seat member 11 communicated to a pressure chamber 12 and a first orifice 13. A piston member 15 having a second orifice 16 for communicating the pressure chamber to an outlet 7, which is pressurized by the pressure chamber is provided at the pressure response valve housing chamber 8. A main valve body 18 linking to the piston member 15 opens and closes a valve port for communicating the condensed water chamber 6 to the outlet 7. The valve port 20 and the condensed water chamber 6 are communicated via a communicating passage 23 which houses a float 25 and is equipped with a glass window. The float sits on the valve seat 24 so that the leak from the pressure response valve is prevented. A trouble is detected through the glass window so that repair in an early stage is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a steam trap that automatically discharges condensate generated in a steam piping system. This invention relates to a pilot type steam trap that drives a valve.

BACKGROUND OF THE INVENTION This type of pilot steam trap has a pressure chamber formed in part by a pressure-receiving displacement wall of a pressure-responsive valve, a first orifice that communicates the pressure chamber with the inlet side, and a first orifice that communicates the pressure chamber with the outlet side. A pilot float valve that opens and closes the second orifice communicating with the first and first refices according to the liquid level on the inlet side to introduce condensate into the pressure chamber to control the pressure and drive the pressure-responsive valve. It consists of a communication passage formed below one orifice and opened and closed by a pressure-responsive valve. An example of this is the
53@Publication [as shown].

Problems to be Solved by the Invention In this case, if the pilot float valve or the pressure-responsive valve itself leaked, a large amount of steam would leak out. Additionally, there was no mechanism to detect this leakage.

Therefore, the technical problem of the present invention is to stop the pressure-responsive valve from leaking when the pressure-responsive valve leaks, and also to be able to detect this leakage condition.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems consists of a pressure chamber partially formed by a pressure-receiving displacement wall of a pressure-responsive valve, and a pressure chamber on the inlet side. A first orifice communicates with the pressure chamber, a second orifice communicates the pressure chamber with the outlet side, and the first orifice is opened and closed depending on the liquid level on the inlet side to introduce condensate into the pressure chamber and control the pressure. In a device equipped with a pilot float valve that drives a response valve and a communication passage formed below the first orifice and opened and closed by the pressure response valve, the communication passage is opened and closed according to the liquid level on the inlet side. It has a glass window that allows floats to be placed and the position of the floats to be inspected.

action The effect of the above technical means is as follows.

First, when the trap is operating normally and the amount of condensate flowing in from the inlet is very small or non-existent, the pilot float valve closes the first orifice and the pressure inside the pressure chamber decreases to the second orifice.
The pressure-responsive valve is closed to equalize the pressure through the orifice. When a large amount of condensate flows in from the inlet, the pilot float valve opens the first orifice. The pressure within the pressure chamber increases and the pressure-responsive valve opens. When the float is operating normally, the float floats and the communication path can be heard. Next, when a leak occurs in the pressure-responsive valve, the liquid level on the inlet side drops, and as the liquid level drops, the float descends to block the communication path and prevent steam from leaking from the communication path to the outlet. Steam leakage can be detected by observing the descending state of the float with the communicating path closed through a glass window.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIGS. 1 and 2).

The lid member 2.3 is fastened to the main body 1 with bolts to form a trap casing. The interior of the trap casing is separated by a partition wall 4 into a condensate reservoir 6 with which the capacitor 5 communicates and a pressure-responsive valve housing chamber 8 with which the outlet lower communicates. The port 5 opens at the top of the condensate reservoir chamber 6 and communicates with it via a screen 9 fixed with a snap ring 17. Outer loa is formed on the same axis as population 5.

A spherical pilot float 10 is housed in a free state in the condensate reservoir 6, and the pilot float 10 rises and falls according to the liquid level in the condensate reservoir 6, and is attached to the partition wall 4 at the bottom of the condensate reservoir *6. It is separated from the valve seat member 11 screwed to the valve seat member 11.

The valve seat member 11 forms an opening on the palm side of the condensate reservoir of a first orifice 13 that communicates the condensate reservoir chamber 6 with a pressure chamber 12 described below.

A cylinder member 14 and a piston member 15 that is movably disposed within the cylinder member 14 are arranged in the pressure-responsive valve housing chamber 8 . The space between the upper surface of the piston member 15 and WX forms the pressure chamber 12. A second orifice 16 is formed in the piston member 15 to communicate the pressure chamber 12 with the lower outlet.

The main valve body 18 is fixed to the lower end of the piston member 15 with a nut 19. The main valve body 1 opens and closes the valve port 20 which communicates the condensate and reservoir chamber 6 with the outlet lower in conjunction with the piston member 15. The valve port 20 is formed at the lower end of the cylinder member 14. The main valve body 18 is urged toward the valve port 20 by a spring 21. The cylinder member 14 has an opening 22 for allowing the liquid flowing out from the valve port 20 to flow to the outlet lower. The piston member 15 and the main valve body 18 constitute a pressure-responsive valve.

A communication passage 23 that communicates the lower part of the condensate reservoir chamber 6 with the valve port 20 is formed below the first orifice 13 . Communication path 2
An annular valve seat 24 is attached to the annular valve seat 3, and a float 25 is placed on and off the annular valve seat 24. Communication path 23. is formed obliquely downward toward the annular valve seat 24. float 25
The plug member 26 prevents the handle from coming out. Through holes 27 and 28 are formed in the plug member 26 and the main body 1.

Two glass plates 29, 30 are attached to the main body 1, and flanges 31, 32 with holes are attached to both sides through gaskets with bolts, so that the position of the float 25 can be inspected. Reference number 33 is a float seat that guides the float 25 to the annular valve seat 26.

The operation of the above embodiment is as follows.

First, when the trap is operating normally and the amount of condensate flowing in from the population 5 is small or absent, the pilot float 10 descends and closes the first orifice 13, and the pressure in the pressure chamber 12 is reduced to the second orifice. 16, the piston member 15 closes the valve port 20 by the inlet side pressure acting on the main valve body 18 and the elastic force of the spring 21. When a large amount of condensate flows in from the population 5, the pilot float 10 floats as the liquid level in the condensate reservoir chamber 6 rises to open the first orifice 13. The pressure inside the pressure chamber 12 increases and pushes down the piston member 15, causing the main valve body 1
8 opens the mouth 20, and 1 from population 5! Drain water to the output lower. During this normal operation, the float 25 floats to a position where it abuts the plug member 26 on the diagonally upper side of the communication passage 23, and
3 is open. Next, when leakage occurs from the main valve body 18, the liquid level on the inlet 5 side decreases, and the float 25 descends and seats on the annular valve seat 24, blocking the communication passage 23 and preventing leakage from the valve port 20. To prevent. The position of this float 25 is inspected through the plate glass 29,30.

Effects of the Invention The present invention produces the following unique effects. As described above, according to the present invention, when steam leaks from the pressure-responsive valve, the communication path is shut off by the float, so that a large amount of steam leak can be prevented. Furthermore, since this condition can be detected through the glass window, defects can be detected early and repaired or replaced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a pilot-type steam trap according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line [-II] of FIG. 1: Main body 5: Inlet 6: To condensate reservoir 7: Outlet 10: To pilot i Float 12: Pressure chamber 13: First orifice 15: Piston member 16: Second orifice 23: Communication path 24: Annular valve seat 25: Float 29.30: plate glass

Claims (1)

[Claims] 1. A pressure chamber partially formed by a pressure-receiving displacement wall of a pressure-responsive valve, a first orifice that communicates the pressure chamber with the inlet side, a second orifice that communicates the pressure chamber with the outlet side, and the first orifice. A pilot float valve opens and closes depending on the liquid level on the inlet side and controls the pressure by introducing condensate into the pressure chamber and drives a pressure-responsive valve. A pilot-type steam trap equipped with a communication passage, in which a float is arranged to open and close the communication passage according to the liquid level on the inlet side, and a glass window is formed so that the position of the float can be inspected.