Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents
Patent
1995-07-17
1997-06-10
Michalsky, Gerald A.
Fluid handling
Diverse fluid containing pressure systems
Fluid separating traps or vents
137195, F16T 120
Patent
active
056366558
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Art
This invention relates to a normally closed or normally open auto-drainage assembly (hereinafter referred to simply as "auto-drain" for brevity) to be inserted into a pneumatic piping system, which supplies pressurized air to a pneumatically operating machine, for the purpose of separating and discharging a drain liquid from the pneumatic piping.
2. Description of the Prior Art
Auto-drains have been known and in use for automatically discharging a drain liquid, including two types of auto-drains: a normally closed auto-drain which is arranged to hold a drain valve body normally in a closed position in relation with a downward movement of a float to stop drain discharges when a drain reservoir case is internally in a pressurized state under the influence of a prevailing fluid pressure and when the drain liquid level is at a low position, opening the drain valve body and discharging the drain liquid out of the reservoir case as soon as the drain liquid level rises to push up the float; and a normally open auto-drain which is arranged to hold a drain valve body normally in an open position to discharge a drain liquid when a drain reservoir case is in a non-pressurized state, closing a drain discharge passage with the drain valve body to stop drain discharging when the reservoir case is internally pressurized similarly unless the float is pushed up by elevation of the drain liquid level.
Illustrated by way of example in FIG. 15 is a conventional normally closed auto-drain 1 including: a drain reservoir case 2 for storing a drain liquid which flows in from above along with pressurized air; a drain discharge guide sleeve 3 which is fitted in an opening at the bottom of the case 2; a drain valve seat 4 which is formed on the inner periphery of a hollow discharge guide shaft 3; a manual valve support member 5 which is fixed on a lower portion of the discharge guide shaft 3; and a manual operating member 6. Below the drain valve seat 4, the discharge guide shaft 3 is formed in a larger diameter than the drain valve seat 4 to provide a drain discharging passage.
A float guide 8 which is connected to an upper portion of the discharge guide shaft 3 is provided with a cylindrical guide portion to guide upward and downward movements of a float 9. A hollow cylindrical piston 10 is slidably fitted in the float guide 8, the piston 10 having a drain valve body (a seal member) 11 fitted on the circumference of its lower hollow shaft portion to close and open a drain passage by seating and unseating the drain valve body on and off the drain valve seat 4.
Defined by the piston 10 within the float guide 8 are an upper pilot chamber 12 and a lower pressure chamber 13 which is communicated with the reservoir case 2 through radial intercommunicating slots 8a. A pilot valve seat 14 opening into the pilot chamber 12 is formed at the upper end of the cylindrical guide portion of the float guide. The pilot valve seat 14 is opened and closed by a pilot valve body 15 which is mounted on a lever 17, which is in turn rockably supported at one end thereof on the upper end of the float guide 8 and linked at the other end to the float 9 through a holder member 18. The piston 10 is internally provided with a partition wall which is formed with an orifice 19 of a smaller diameter than the above-described pilot valve seat 14, thereby communicating the pilot chamber 12 with the inner cavity of the hollow cylindrical piston 10 which is opened to the outside through the manual operating member 6. Further, a first spring 21 is charged in the pilot chamber 12 to bias the piston 10 in the downward direction, while a second spring 22 is charged between the piston 10 and a lifting tube 6a of the manual operating member 6 to bias the piston 10 in the upward direction.
With the known auto-drain of the above-described construction, the float 9 is lowered to close the pilot valve seat 14 with the pilot valve body 15 when the reservoir case is internally pressurized by influent pressurized air and the drain l
REFERENCES:
patent: 758965 (1904-05-01), Gulland
patent: 849401 (1907-04-01), Kelley
patent: 3993090 (1976-11-01), Hankison
Kawamura Junya
Kimura Yasuhisa
Michalsky Gerald A.
SMC Corporation
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