JP6185238B2 - Float steam trap with bypass valve - Google Patents

Description

The present invention relates to a float-type steam trap with a bypass valve, in which a bypass valve is integrated with a float-type steam trap that automatically discharges condensate from a steam piping system to the outside using a float. This type of steam trap opens a bypass valve when a large amount of condensate occurs temporarily or an air failure occurs. It is something to do.

An example of the float steam trap with a bypass valve is disclosed in Patent Document 1. The trap casing is formed with an inlet, a valve chamber communicating from the inlet, an outlet passage communicating from the valve chamber via the valve port, and an outlet communicating from the outlet channel. A free passage inside the chamber, a bypass passage communicating with the valve chamber and the outlet passage is formed in the trap casing, a bypass valve for opening and closing the bypass passage is provided, and a screen having a filter hole for capturing foreign matter in the fluid is valved. It is arranged indoors.

Japanese Examined Patent Publication No. 6-68355

The above-mentioned conventional float type steam trap with bypass valve discharges a large amount of condensate in a short time by opening the bypass valve when a large amount of condensate occurs temporarily or an air failure occurs. However, since the fluid from the inlet does not pass through the filter hole of the screen and reaches the bypass valve, the bypass valve cannot completely close the bypass passage due to foreign matter in the fluid. There is.

Accordingly, the problem to be solved by the present invention is to provide a float steam trap with a bypass valve that can prevent the bypass valve from being unable to completely close the bypass passage by foreign matter in the fluid.

In order to solve the above problems, a float steam trap with a bypass valve according to the present invention includes an inlet to the trap casing, a valve chamber communicating from the inlet, an outlet passage communicating from the valve chamber via the valve port, and an outlet A bypass that opens and closes the bypass passage is formed in the trap casing, and a float passage that opens and closes the valve opening is formed in the valve chamber in a free state, and a bypass passage that connects the valve chamber and the outlet passage is formed in the trap casing. A valve is provided and a screen having a filter hole for capturing foreign matter in the fluid is arranged in the valve chamber, and all of the fluid from the inlet passes through the filter hole of the screen and reaches the bypass valve. It is.

Since the float type steam trap with a bypass valve of the present invention reaches the bypass valve after all of the fluid from the inlet passes through the filter hole of the screen, the bypass valve can completely close the bypass passage by foreign matter in the fluid. This produces an excellent effect of preventing disappearance.

It is sectional drawing of the float type steam trap with a bypass valve concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A lid 2 is fastened to the main body 1 with bolts (not shown) to form a trap casing having a valve chamber 3 therein. An inlet 4 is formed at the top of the main body 1 and an outlet 5 is formed on the same axis as the inlet 4. A cylindrical screen 6 having a peripheral wall having a filter hole for capturing foreign matter in the fluid is disposed in the valve chamber 3. An outlet passage 8 communicating with the outlet 5 is formed on the side of the valve chamber 3 with a partition wall 7 therebetween. A valve seat member 10 having a valve opening 9 is screwed to the lower part of the partition wall 7, and the valve chamber 3 communicates with the outlet passage 8 through the valve opening 9. A hollow spherical float 11 made of a stainless steel thin plate is placed in the valve chamber 3 in a free state. The float 11 rises and falls according to the water level of the condensate accumulated in the valve chamber 3 to open and close the valve port 9 and automatically discharge the condensate accumulated in the valve chamber 3. All of the fluid from the inlet 4 reaches the valve port 9 after passing through the filter holes of the screen 6 from the outside to the inside.

A bypass passage 12 that connects the valve chamber 3 and the outlet passage 8 is formed from the top of the main body 1 through the lid 2. A bypass valve 14 composed of a ball valve provided with a horizontal single-shaped opening 13 for opening and closing the bypass passage 12 at a horizontal portion of the bypass passage 12 is sandwiched between valve seats 15 and 16 by a valve shaft 17 for rotating operation. It is arranged so that it can rotate freely. All of the fluid from the inlet 4 reaches the bypass valve 14 after passing through the filter hole of the screen 6 from outside to inside. The valve seat 15 is fixed by a plug 18 screwed to the lid 2. A communication passage 19 that forms part of the bypass passage 12 is formed in the plug 18. An exhaust passage 20 that allows the valve chamber 3 to communicate with the bypass passage 12 on the downstream side of the bypass valve 14 is formed in the lid 2. An exhaust valve seat 23 having an exhaust valve port 22 opened in the exhaust passage 20 is screwed with a holding guide 24 interposed therebetween, and the valve chamber 3 and the exhaust passage 20 are communicated with each other through the exhaust valve port 22. The temperature responsive valve 26 is locked to the holding guide 24 by a spring 25 locked to the holding guide 24. Although not shown in the figure, the temperature responsive valve 26 is formed by filling a thin plate diaphragm and a thermal expansion / contraction liquid inside. After all of the fluid from the inlet 4 has passed through the filter holes of the screen 6 from outside to inside, it reaches the temperature responsive valve 26. By rotating the bypass valve 14 via the valve shaft 17, the bypass passage 12 can be switched between a position where the bypass passage 12 communicates with the single-shaped opening 13 and a position where the bypass passage 12 is blocked.

The operation of the above embodiment will be described. Normally, the bypass passage 12 is used at a position where the bypass passage 12 is blocked by operating the valve shaft 17 and rotating the bypass valve 14 by 90 degrees from the illustrated state. The float 11 rises and falls according to the water level of the condensate accumulated in the valve chamber 3 to open and close the valve port 9, and the condensate accumulated in the valve chamber 3 is automatically discharged from the valve port 9 to the outlet 5 through the outlet passage 8. . Further, the temperature responsive valve 26 opens and closes the exhaust valve port 22 according to the temperature of the valve chamber 3, and the air accumulated in the valve chamber 3 is discharged from the exhaust valve port 22 to the exhaust passage 20, the bypass passage 12 on the downstream side of the bypass valve 14, It is automatically discharged to the outlet 5 through the outlet passage 8.

When the condensate temporarily generated in a large amount is discharged in a short time or when the temperature responsive valve 26 cannot be opened, the valve shaft 17 is operated to rotate the bypass valve 14 and the state shown in the figure. By doing so, the bypass passage 12 is communicated with the one-shaped opening 13 so that a large amount of condensate is discharged in a short time or air trouble is eliminated.

INDUSTRIAL APPLICABILITY The present invention can be used for a float steam trap with a bypass valve in which a bypass valve is integrally combined with a float steam trap that automatically discharges condensate from a steam piping system using a float.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Valve chamber 4 Inlet 5 Outlet 6 Screen 8 Outlet passage 9 Valve port 11 Float 12 Bypass passage 13 Character-like opening 14 Bypass valve 20 Exhaust passage 26 Temperature-responsive valve

Claims (1)

Forming an inlet to the trap casing, a valve chamber communicating from the inlet, an outlet passage communicating from the valve chamber via the valve port, and an outlet communicating from the outlet passage;
A float that opens and closes the valve port is placed in a free state in the valve chamber,
By forming a bypass passage in the trap casing that connects the valve chamber and the outlet passage,
The temperature responsive valve and the bypass valve to open and close the bypass passage respectively provided,
In a screen having a filter hole for trapping foreign matter in the fluid disposed in the valve chamber,
A float type steam trap with a bypass valve, wherein all of the fluid from the inlet passes directly to either the temperature responsive valve or the bypass valve after passing through the filter hole of the screen.

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