JP4879602B2 - Float type steam trap - Google Patents

Description

  The present invention relates to a float type steam trap that opens and closes a valve port by floating and lowering of a float, and particularly relates to a type that can discharge a large amount of condensate at low pressure.

  Float type steam traps are automatic valves that are attached to steam-using equipment and steam pipes and discharge condensate. However, when steam starts to be used, the equipment and pipes are cold, so a large amount of condensate is generated and used. It is a general usage method that the amount of condensate significantly decreases when the state enters a steady state. Therefore, conventionally, a low-pressure, large-capacity float type steam trap disclosed in Japanese Patent Laid-Open No. 1-131397 has been used. This is achieved by connecting a plurality of valve openings that open to the condensate reservoir connected to the inlet to the same outlet passage that communicates with the outlet. The opening is opened and closed, at least one valve opening is sized so that the corresponding float can be opened over the entire operating pressure range, and the other valve opening is in a predetermined low pressure range. It is formed in such a size that only the valve can be opened, and a closed float and an open bucket float are used as a plurality of floats.

Since the conventional float type steam trap uses an open bucket float, an introduction pipe for introducing a fluid into the open bucket float and a launch pad for holding the lowered open bucket float in a predetermined posture Etc., and the structure is complicated.
JP-A-6-241396

  The problem to be solved is to provide a float steam trap with a simple structure and a large capacity at low pressure.

The means of the present invention devised to solve the above-mentioned problem is that a plurality of valve openings that open to a condensate reservoir connected to the inlet are connected to the same outlet passage that communicates with the outlet, and a plurality of condensate reservoirs are connected to the condensate reservoir. Are floated and lowered in the room so as to open and close the respective valve ports, and at least one valve port is sized so that the corresponding float can be opened over the entire working pressure range. The valve port is formed in such a size that the corresponding float can be opened only in a predetermined low pressure range, and when the pressure on the inlet side is higher than the predetermined value, the float remains closed once the valve is closed. The float type steam trap is characterized in that each float is formed of a closed float.

  The present invention produces an excellent effect of providing a large-capacity float steam trap at a low pressure with a simple structure by opening and closing each of the plurality of valve ports with a sealed float.

  Since the float type steam trap of the present invention uses a closed float as each float that opens and closes a plurality of valve openings, the introduction pipe and launch pad when using an open bucket float can be made unnecessary. Can be a simple structure.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A lid 2 is fastened to the main body 1 with bolts (not shown) to form a valve casing, and a condensate reservoir 3 is formed inside. An inlet 4 is opened at the top of the condensate reservoir 3 and an outlet 5 is formed on the same axis as the inlet 4. A partition wall member 6 that divides the condensate reservoir chamber 3 into an upper condensate reservoir chamber 3 a and a lower condensate reservoir chamber 3 b is fixed in the condensate reservoir chamber 3. A plurality of openings 7 for communicating the upper condensate reservoir 3a and the lower condensate reservoir 3b are formed in the partition wall member 6. The upper valve seat member 9a is inserted into the main body 1 from the upper valve seat mounting port 8a and screwed to the main body 1, and the upper valve seat mounting port 8a is closed with the upper plug 10a. The lower valve seat member 9b is inserted into the main body 1 from the lower valve seat mounting port 8b and screwed to the main body 1, and the lower valve seat mounting port 8b is closed with the lower plug 10b. The upper valve seat member 9a has an upper valve port 11a that communicates the upper condensate reservoir 3a to the outlet 5 side, and the upper condensate reservoir 3a communicates with the outlet 5 through the outlet passage 12 from the upper valve port 11a. The lower valve seat member 9b has a lower valve port 11b that allows the lower condensate reservoir 3b to communicate with the outlet 5, and the lower condensate reservoir 3b communicates with the outlet 5 from the lower valve port 11b through the outlet passage 12.

  A closed hollow spherical upper float 13a for opening and closing the upper valve port 11a is accommodated in the upper condensate reservoir 3a in a free state, and a closed hollow spherical shape for opening and closing the lower valve port 11b in the lower condensate reservoir 3b. The lower float 13b is accommodated in a free state. The upper valve port 11a is formed in such a size that the corresponding upper float 13a can be opened over the entire pressure range, and the lower valve port 11b is formed in such a size that the corresponding lower float 13b can be opened only in a predetermined low pressure range. Form. An upper float seat 14 a that defines the lowering position of the upper float 13 a is formed on the partition member 6, and a lower float seat 14 b that defines the lowering position of the lower float 13 b is formed on the bottom wall of the main body 1.

  The mixed fluid of condensate and steam flowing in from the inlet 4 flows down to the upper condensate reservoir 3a and the lower condensate reservoir 3b. When the pressure on the inlet 4 side is lower than a predetermined value, when the condensate flows down, the lower float 13b and the upper float 13a are lifted up and separated from the upper valve seat member 9a and the lower valve seat member 9b. The opening 11 a and the lower valve opening 11 b are opened, and the condensate is discharged from the outlet passage 12 to the outlet 5. When the pressure on the inlet 4 side is higher than a predetermined value, once the lower float 13b is closed, the lower float 13b cannot be separated from the lower valve seat member 9b due to the pressure difference across the lower valve port 11b, and remains closed. Condensate flowing in from the inlet 4 is discharged from the outlet passage 12 to the outlet 5 through the opening of the upper valve port 11a due to the floating of the upper float 13a.

Sectional drawing of the float type steam trap of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Condensate reservoir 3a Upper condensate reservoir 3b Lower condensate reservoir 4 Inlet 5 Outlet 9a Upper valve seat member 9b Lower valve seat member 11a Upper valve port 11b Lower valve port 12 Outlet passage 13a Upper float 13b Bottom float

Claims (1)

Multiple valve ports that open to the condensate reservoir connected to the inlet are connected to the same outlet passage that communicates with the outlet, and multiple floats float and descend in the condensate reservoir chamber to open and close each valve port. And at least one valve port is sized so that the corresponding float can be opened over the entire working pressure range, and the other valve port is opened only when the corresponding float is at a predetermined low pressure range. When the pressure on the inlet side is higher than a predetermined value, the float is kept closed once it is closed, and a plurality of floats are formed with sealed floats. steam trap.

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