JP4790403B2 - Float type steam trap - Google Patents

Description

  The present invention relates to a float-type steam trap that automatically discharges drain generated in a steam piping system by floating up and down of the float, and more particularly to a type that can clean foreign matter in a fluid adhering to a valve seat member on which a float is seated.

  A conventional float type steam trap forms an inlet, a valve chamber, and an outlet with a valve casing, attaches a valve seat member to the lower portion of the valve chamber, forms a discharge passage that communicates the valve chamber with the valve seat member on the outlet side, A float that opens and closes the discharge passage by seating on and off the valve seat member is arranged in the valve chamber, and an operation member that can be moved forward and backward from the outside is placed in the discharge passage. It cleans up foreign matter adhering to the inner surface of the passage.

In the conventional float type steam trap, if the seal member that keeps the airtightness of the operation member deteriorates, the fluid in the valve casing may be ejected to the outside and burned when the operation member is advanced or retracted from the outside. was there.
Japanese Utility Model Publication No. 49-36747

  The problem to be solved is to prevent burns even if the fluid in the valve casing is ejected to the outside.

In the present invention, an inlet, a valve chamber, and an outlet are formed in a valve casing, a valve seat member is attached to a lower portion of the valve chamber, a discharge passage that communicates the valve chamber with the outlet side is formed in the valve seat member, and the valve chamber A float that opens and closes the discharge passage by being seated on and off the seat member, and an operation member that can be moved forward and backward from the outside is disposed in the discharge passage, and between the operation member and the plug connected to the valve casing, A sealing member that maintains airtightness is disposed, and a fluid shielding member that is formed to have a larger outer diameter than the sealing member is disposed between the sealing member and the advancing / retreating operation portion of the operating member.

  According to the present invention, when the operation member is operated to advance and retract from the outside, even if the fluid in the valve casing is ejected to the outside from the portion of the seal member, the ejected fluid reaches the advance / retreat operation portion of the operation member by the fluid shielding member. Since it can prevent, it has the outstanding effect that it can prevent a burn.

The float type steam trap of the present invention has an operation member that can be operated forward and backward in the discharge passage, and a seal member that keeps the airtightness of the operation member between the plug coupled to the valve casing and the operation member is arranged. In addition, a fluid shielding member having an outer diameter larger than that of the seal member is disposed between the seal member and the advancing / retreating operation portion of the operation member. Therefore, even if the fluid in the valve casing is ejected to the outside from the part of the seal member that keeps the airtightness of the operation member when the operation member is operated to advance and retract from the outside by operating the advance / retreat operation part of the operation member, the seal member The fluid shielding member formed to have a larger outer diameter can prevent the ejected fluid from reaching the advancing / retreating operation portion of the operating member. Therefore, it is possible to prevent burns.

  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 3 to form a valve casing, and a valve chamber 4 is formed inside. The main body 1 has an inlet 5, an outlet passage 6 and an outlet 7, and the inlet 5 communicates with the upper portion of the valve chamber 4. The inlet 5 and the outlet 7 are formed on the same axis. A valve seat member 9 having a discharge passage 8 is screwed to the lid 2 at the bottom of the valve chamber 4. The discharge passage 8 includes a small-diameter leading end portion 8a at the end of the valve chamber 4, a tapered portion 8b having a diameter increasing toward the downstream downstream of the leading end portion 8a, and a large-diameter rear end portion 8c downstream of the tapered portion 8b. Become. The lid 2 has an outlet passage 10, and the lower portion of the valve chamber 4 communicates from the discharge passage 8 to the outlet 7 through the outlet passages 10 and 6. A hollow spherical float 11 that opens and closes the discharge passage 8 by being seated on the valve chamber side end surface 9a of the valve seat member 9 is disposed in the valve chamber 4 in a free state. Two float seats 12 with which the float 11 abuts at the position where the discharge passage 8 is closed are provided below the float 11 on the side facing the front side of the drawing.

  A plug 13 is screwed to the lid 2 on the same axis as the valve seat member 9. The operating member 14 is screwed to the plug 13 so as to be adjustable from the outside. The operating member 14 passes through the plug 13, and the tip end portion 14 a located downstream of the tip end portion 8 a of the discharge passage 8 projects into the valve chamber 4 by advance, and the rear end portion is located outside. A packing 15 as a sealing member for keeping the airtightness of the operation member 14 is disposed between the plug 13 and the operation member 14, and a packing presser 16 is screwed to the plug 13. The outer diameter of the distal end portion 14a of the operation member 14 is formed to be slightly smaller than the inner diameter of the distal end portion 8a of the discharge passage 8. When the operation member 14 is advanced, the distal end portion 14a of the operation member 14 causes the discharge passage 8 to Clean the inner surface of the tip 8a. A tapered valve member 17 is formed integrally with the operation member 14 behind the distal end portion 14 a of the operation member 14. The valve member 17 of the operating member 14 is seated on the tapered portion 8b of the discharge passage 8 and is closed when the discharge passage 8 is advanced and closed. A slit 18 is provided as an advancing / retracting operation part in which a tip of a tool such as a screwdriver is fitted and rotated at the rear end of the operation member 14. A fluid shielding member 19 having an outer diameter larger than that of the packing 15 is fixed to the outer periphery of the operation member 14 between the packing 15 and the cut 18 by a snap ring 20.

  Drain flowing in from the inlet 5 accumulates in the valve chamber 4, and the float 11 rises and falls according to the liquid level and is seated on and off the valve seat member 9 to open and close the discharge passage 8. When the discharge passage 8 is opened, drain in the valve chamber 4 is discharged to the outlet 7 through the discharge passage 8 and the outlet passages 6 and 10, and when the discharge passage 8 is closed, leakage of gas in the valve chamber 4 is prevented.

  When cleaning foreign matter adhering to the inner end surface 8a of the discharge passage 8 of the valve seat member 9 and the end surface 9a on the valve chamber side, the operation member 14 is screwed by inserting the front end of a tool such as a screwdriver into the cut 18 of the operation member 14. The valve member 17 of the member 14 is seated on the tapered portion 8b of the discharge passage 8 and advanced to a position where the discharge passage 8 is closed. Accordingly, the inner surface of the distal end portion 8a of the discharge passage 8 of the valve seat member 9 is cleaned by the distal end portion 14a of the operation member 14. Then, after raising the liquid level in the valve chamber 4, the operation member 14 is retracted to open the discharge passage 8, and the distal end portion 14 a of the operation member 14 is positioned downstream of the distal end portion 8 a of the discharge passage 8. The drain in the valve chamber 4 is discharged to the outlet 7 at once while cleaning the foreign matter adhering to the valve chamber side end surface 9 a of the valve seat member 9. At this time, even if the discharge drain is ejected from the packing 15 to the outside, the fluid drainage member 19 can prevent the discharge drain from reaching the cut portion 18 and can prevent burns.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 4 Valve chamber 5 Inlet 6,10 Outlet passage 7 Outlet 8 Outlet passage 8a Discharge passage tip 9 Valve seat member 9a Valve seat side end face 11 of valve seat member Float 13 Plug 14 Operation member 14a End of operation member Portion 17 Valve member 18 Cut 19 Fluid shielding member

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet, a valve seat member is attached to the lower portion of the valve chamber, a discharge passage that communicates the valve chamber with the outlet side is formed in the valve seat member, and the valve seat member is separated from the valve seat member. A seal that keeps the airtightness of the operating member between the plug connected to the valve casing and the operating member in the case where the float that opens and closes the discharging passage is arranged and the operating member that can be moved forward and backward is arranged in the discharging passage. A float type steam trap, wherein a member is arranged and a fluid shielding member having an outer diameter larger than that of the sealing member is arranged between the sealing member and the advancing / retreating operation portion of the operating member.

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