Valves and valve actuation – Reciprocating valve – Gate
Reexamination Certificate
2000-02-23
2001-12-04
Shaver, Kevin (Department: 3754)
Valves and valve actuation
Reciprocating valve
Gate
C251S326000, C251S333000, C137S015010
Reexamination Certificate
active
06325358
ABSTRACT:
FIELD OF THE INVENTION
The invention herein pertains to valves and particularly to gate valves that are used to control the flow of powders, granules and other dry materials. The valve includes a movable slide which has an arcuate front end which, in conjunction with the flared forward end of the passageway, prevents clogging of the valve and jamming of the slide during use.
DESCRIPTION OF THE PRIOR ART AND OBJECTIVES OF THE INVENTION
The control of dry or granular materials through valves has long been troublesome in that during valve closing, the dry material tends to cling to the slide and/or passageway, to prevent the valve from completely closing. The incomplete closing of the valve will allow the valve to leak. Clogging or sticking valves can cause serious maintenance concerns in addition to unwanted powder or granule distribution due to the valves remaining partially open. This concern is of particular importance in the agricultural industry where fertilizers, defoliants and insecticides must be precisely distributed without unwanted spillages due to the low profit margins, and environmental hazards which can be caused.
It is therefore an objective of the present invention to provide a gate valve which includes a slide having an arcuate concave end to encourage full closure.
It is another objective of the present invention to provide a gate valve having first and second passageway segments with the slide positioned therebetween.
It is still a further objective of the present invention to provide a gate valve in which the second passageway segment is flared to increase granular flow therethrough.
Various other objectives and advantages of the present invention will become apparent to those skilled in the art as a more detailed description is set forth below.
SUMMARY OF THE INVENTION
The invention herein pertains to a gate valve and particularly to a gate valve to prevent the tendency of the valve to stick or clog when used with dry materials such as granules or powder. The valve includes a passageway which is divided into segments by a movable planar slide. The forward end of the second or lower passageway is flared and the slide has an arcuate concave configuration to facilitate closing and lessen the possibility of granular material becoming lodged between the slide seat, slide and passageway walls. An access door is hingeably attached to the forward end of the valve seat for cleaning purposes.
REFERENCES:
patent: 1801237 (1931-04-01), Hanson
patent: 3316929 (1967-05-01), Milette
patent: 3333814 (1967-08-01), Sargent
patent: 3941349 (1976-03-01), Pierson
patent: 4646777 (1987-03-01), Stalder et al.
patent: 4830233 (1989-05-01), Thelen et al.
patent: 4875504 (1989-10-01), Nicholson
patent: 5078180 (1992-01-01), Collins
patent: 5445190 (1995-08-01), Gunder
patent: 6050288 (2000-04-01), Junier
Bonderer D. Austin
Shaver Kevin
LandOfFree
Gate valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gate valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gate valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2577179