GATE VALVE

• US 20120161055A1
• Filed: 09/03/2010
• Published: 06/28/2012
• Est. Priority Date: 09/03/2009
• Status: Active Grant

• Current Assignee: Ulvac Incorporated
• Original Assignee: Ulvac Incorporated
• Inventors: Nakamura, Kyuzo, Shibayama, Kouji, Wada, Shinichi, Sakoda, Seiya
• Granted Patent: US 8,733,734 B2
• Time in Patent Office: Days
• US Class Current: 251/329
• CPC Class Codes: F16K 1/2085 Movable sealing bodies
• CPC Class Codes: F16K 3/10 with special arrangements for separating the sealing faces or for pressing them together
• CPC Class Codes: F16K 3/188 by means of hydraulic forces

Abstract

A gate valve includes: a valve box; a support body disposed inside a hollow portion; a valve plate including a fixed valving section, a movable valving section sliding in a direction in which a flow passage is extended, a first peripheral region; and a second peripheral region; a first biasing section disposed at the first peripheral region, allowing the movable valving section to move toward a first opening portion, allowing the movable valving section to come into contact with an inner surface, pressing the movable valving section onto the inner surface, and closing the flow passage; and a second biasing section disposed at the second peripheral region, allowing the movable valving section to move toward a second opening portion, and releasing the flow passage by separating the movable valving section from the inner surface.

Claims

1. A gate valve comprising:

a valve box comprising;

a hollow portion;

a first opening portion and a second opening portion that are provided so as to sandwich the hollow portion;

an inner surface formed around the first opening portion; and

a flow passage passing through the hollow portion, the first opening portion, and the second opening portion;

a support body disposed inside the hollow portion;

a valve plate comprising;

a fixed valving section that is securely fixed to the support body;

a movable valving section disposed so as to surround the outer-periphery of the fixed valving section;

a first peripheral region; and

a second peripheral region, the movable valving section sliding in a direction in which the flow passage is extended;

a first biasing section disposed at the first peripheral region, allowing the movable valving section to move toward the first opening portion, allowing the movable valving section to come into contact with the inner surface, pressing the movable valving section onto the inner surface, and closing the flow passage; and

a second biasing section disposed at the second peripheral region, allowing the movable valving section to move toward the second opening portion, and releasing the flow passage by separating the movable valving section from the inner surface.

2. The gate valve according to claim 1, wherein

the movable valving section comprises a first seal portion which is in contact with the inner surface and is pressed onto the inner surface, and the first biasing section is an elastic element provided directly blow the first seal portion in the movable valving section.

3. The gate valve according to claim 1, wherein

the second biasing section is a single air cylinder which is formed between the fixed valving section and the movable valving section in the second peripheral region and which is ring-shaped.

4. The gate valve according to claim 1, wherein

the first biasing section is arranged in parallel with a direction in which the movable valving section slides and so as to approximate the second biasing section.

5. The gate valve according to claim 1, wherein

the fixed valving section includes a second seal portion, a third seal portion, and a wiper, and the wiper is disposed at a position which is closer to the second opening portion than the third seal portion.