Claims
- 1. A thermally-actuated steam trap comprising:
- a valve casing having an inlet, a valve chest and an outlet,
- a valve seat member disposed between the valve chest and the outlet,
- a temperature control element disposed in the valve chest adjacent to the valve seat member and including a cover member, a diaphragm and a valve member further containing an expansible medium,
- at least one introducing passage through which a space formed between the valve seat member and the diaphragm communicates with the valve chest when the valve member is open, and
- at least one discharge passage through which said space communicates with the outlet, said at least one introducing passage and the at least one discharge passage being provided in the valve seat member and said valve member for opening and closing the at least one introducing passage being disposed in said space.
- 2. A thermally-actuated steam trap according to claim 1, wherein said temperature control element comprises the cover member, the diaphragm, the valve member and an annular spacer, said annular spacer secured to the upper face of said valve seat member, the diaphragm and the cover member are secured at the outer peripheral edges which are mutually in contact, the valve member having a through hole is disposed in a space formed by the valve seat member, the annular spacer and the diaphragm, said valve member is secured to the diaphragm, a discharge passage through which said space communicates with an outlet is bored in the central part of the valve seat member and introducing passages through which said space communicates with the valve chest are opened on the circumference thereof.
- 3. A thermally-actuated steam trap according to claim 1, wherein said temperature control element comprises the cover member, the diaphragm, the valve member and an annular spacer, the annular spacer secured to the upper face of said valve seat member, the diaphragm and the cover member are secured at their outer peripheral edges which are mutually in contact, the valve member secured to the diaphragm is disposed in a space formed by the valve seat member, the annular spacer and the diaphragm, an introducing passage through which said space communicates with a valve chest is opened on the central part of the upper face of the valve seat member, discharge passages through which said space communicates with an outlet are opened on the circumference thereof, and when the valve member is seated, only the introducing passage is closed.
- 4. A thermally-actuated steam trap according to claim 1, wherein said diaphragm is used to prevent said expansible medium from exiting through said at least one discharge passage, and
- when said diaphragm breaks, said expansible medium exits through said at least one discharge passage, and condensate from said at least one introducing passage displaces said valve member enabling said condensate to be discharged through said outlet via said at least one discharge passage.
- 5. A thermally-actuated steam trap according to claim 1, wherein said valve member includes a through hole for communication between said diaphragm and said at least one discharge passage.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-76781 |
Mar 1991 |
JPX |
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Parent Case Info
This is a divisional of co-pending application Ser. No. 07/851,388 filed Mar. 12, 1992, now U.S. Pat. No. 5,197,669.
US Referenced Citations (7)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0012267 |
Jun 1980 |
EPX |
0171464 |
Feb 1986 |
EPX |
158892 |
Apr 1904 |
DE2 |
2630038 |
Jul 1976 |
DEX |
3124664 |
Jan 1983 |
DEX |
Non-Patent Literature Citations (2)
Entry |
European Patent Search Report, EP 92 10 4066, May 26, 1992. |
Form PTO-892 (Rev. Mar. 1979) filed by Examiner on Jun. 11, 1992. |
Divisions (1)
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Number |
Date |
Country |
Parent |
851388 |
Mar 1992 |
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