Large caliber high pound level alloy steel gate valve
A high-grade, alloy steel technology, used in sliding valves, valve details, valve devices, etc., can solve problems such as scrap, seizing, and gate valve leakage, and achieve the effect of ensuring the blocking effect.
Inactive Publication Date: 2009-08-19
盐城通商阀门有限公司
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Problems solved by technology
The disadvantage of this method is that the welding layer is easy to fall off, causing the gate valve to leak
Similarly, in order to ensure the blocking performance of the gate valve, the staff is used to pressing the gate down as much as possible during operation to ensure the tight fit between the gate and the sealing surface of the valve seat. It will cause gate deformation, seizure, sealing surface strain, etc., resulting in the gate valve being scrapped
Method used
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[0010] Large-caliber high-pound grade alloy steel gate valve includes valve body 1, valve seat 2, gate plate 3, closing stopper 4, valve cover and valve stem. The valve body 1 and the valve cover are fixedly connected by screws, and the valve stem is located in the valve body 1. In the valve cover, the outer end of the valve stem is fixed with a handwheel or connected to the electric mechanism. The inner end of the valve stem is connected with the gate 3 through a hook groove, and the closing stopper 4 is fixed and connected to the valve directly under the gate 3 by screws On the inner wall of the body 1, the height of the closing stopper 4 is based on the best tight fit between the gate plate 3 and the valve seat 2 when the lower edge of the gate plate 3 contacts the closing stopper 4. An annular U-shaped welding groove 6 is respectively opened on both ends of the gate plate 3, and the cobalt-based ring 5 is fixed on the U-shaped welding groove 6 by welding. An annular U-shaped w...
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The invention provides an alloy steel gate valve with a large diameter and a high weight range, and relates to the technical field. The gate valve at least comprises a valve body, a valve seat, a shutter, a valve cover and a valve stem. The valve body is fixedly connected with the valve cover, and the valve stem is arranged in the valve body and the valve cover. The outer end of the valve stem is fixed with a hand wheel or is connected with an electric mechanism in a transmission manner, and the inner end of the valve stem is connected with the shutter. Hard alloy steel rings are respectively arranged on sealing surfaces of the shutter and the valve seat. The invention is characterized that the gate valve further comprises a closing and limiting device which is fixedly connected to the inner wall of the valve body right below the shutter. The height of the closing and limiting device is based on the optimum close fit state of the shutter and the valve seat when the bottom edge of the shutter contacts with the closing and limiting device. U-shaped welding grooves are formed on fixing surfaces of the shutter and the cemented carbide steel rings, and of the valve seat and the hard alloy steel rings respectively. The invention has the advantages that: first, detachment of wielding layers can be avoided; second, the two sealing surfaces of the shutter and the valve seat can be jointed in the optimum close fit state.
Description
Technical field [0001] The utility model relates to a valve, particularly a large-caliber high-pound alloy steel gate valve. Background technique [0002] Gate valve is a general-purpose pipeline pressure device. It has the characteristics of small flow resistance and strong flow capacity. It is often used in high-pressure tanks, high-temperature and high-pressure oil or steam pipelines and other harsh environmental fields. In order to ensure the blocking performance of the gate valve, when the gate valve is closed, the gate plate and the valve seat must be in a tightly matched state, which causes the friction between the gate plate and the valve seat to be very large during the opening or closing process of the gate valve. In order to reduce the wear of the sealing surface of the gate and the valve seat, the prior art adopts a method of directly overlaying hard alloy steel on the sealing surfaces of the gate and the valve seat. The disadvantage of this method is that the welding...
Claims
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IPC IPC(8): F16K3/02F16K3/16F16K37/00F16K25/00
Inventor 韩江龚正林顾云飞
Owner 盐城通商阀门有限公司