Broadspectrum corrosion resistant, wear resistant and high temperature resistant swing check valve
A high-temperature, swing-type technology, applied in valve details, control valves, valve devices, etc., can solve the problems of reduced corrosion resistance and wear resistance, inability to greatly reduce costs, and expensive production costs, and improve corrosion resistance and wear resistance. Wear high temperature resistance, achieve mass production, reduce the effect of using precious alloys
Inactive Publication Date: 2009-03-25
DAZHONG VALVE FACTORY ZHEJIANG PROV
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Problems solved by technology
Corrosion-resistant alloy check valves have the following common features: the valve body and disc are made of corrosion-resistant alloy materials as a whole, and the consumption of precious metals such as nickel is large and the cost is high.
Moreover, it still does not have broad-spectrum corrosion resistance in the series of strong corrosive media
At high temperature, the high-temperature strength and hardness of the material will decrease, and the corrosion resistance and wear resistance will decrease. The passive situation where the material and the medium are seated one by one cannot be avoided. It is difficult to achieve mass production and greatly reduce the cost.
The ceramic check valve is corrosion-resistant, wear-resistant and high-temperature resistant, and is suitable for the above three media conditions. Its serious shortcomings are: 1. The disc of the swing check valve will inevitably produce an impact on the sealing surface of the disc valve body during the switching process. Low impact resistance is the Achilles' heel of ceramic materials
2) The manufacturing process of the valve body cavity and sealing surface is complicated. In order to meet this requirement, ceramic materials must invest in a variety of special equipment, and the production cost is expensive.
Therefore, ceramic check valve technology is difficult to push
Method used
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[0012] see figure 1 , the check valve of the present invention comprises main parts such as eye bolt 1, lug 2, screw 3, valve disc 4 and valve body 5; It is installed on the pipeline in the way of clamping; the valve flap 4 is also a slightly smaller flange-shaped sealing element, and is inserted into the valve body 5 in the way that the pin shaft is inserted into the lug 2. The sealing pair of the valve seat is a roof-shaped knife-edge sealing surface with an included angle greater than 120°, and the width of the knife-edge is less than or equal to 0.10mm. Valve body 5, valve disc 4 and other flow components are compounded by two or more metal materials through surface metallurgy technology; the blank material is heat-resistant alloy cast steel; a layer of thickness 1.0-1.4 is compounded on the working surface mm of cobalt-based case-hardening alloys.
[0013] The medium pressure from the upstream direction pushes the disc 4 to swing upward and right around the axis of the ...
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Abstract
The invention relates to a swing check valve with broad spectrum, corrosion resistance and wearing resistance. The swing check valve consists of main components, such as an eye bolt 1, a lug 2, a bolt 3, a valve clack 4, a valve body 5, and the like. The swing check valve can be widely applied to fume discharge systems, desulfurization denitration systems and screenings treating systems in the industries such as petroleum chemical engineering, biopharmaceuticals, mine metallurgy, coal-fired generating, paper making, environmental protection, and the like, resists strong corrosive media such as sulfur dioxide, sulfuric acid, hydrochloric acid, aqua regia, and the like, has a knife-shaped sealing and ultrathin structure, is arranged on a pipeline in a butt clamp way, and has the advantages of corrosion resistance, corrosion resistance, high temperature resistance and long service life.
Description
technical field [0001] The present invention relates to a valve sealing device, in particular to a device that can be widely used in smoke and dust discharge systems, desulfurization and denitrification systems, and pulp and slag treatment systems in many industries such as petrochemical industry, biopharmaceuticals, mining metallurgy, coal-fired power generation, papermaking, and environmental protection. Broad-spectrum corrosion-resistant, wear-resistant and high-temperature-resistant swing check valve. Background technique [0002] In petrochemical, biopharmaceutical, mining metallurgy, coal-fired power generation, papermaking and environmental protection industries, such as smoke and dust emission systems, desulfurization and denitrification systems, and pulp and slag treatment systems, swing check valves usually need to face the following media Situation: 1) Corrosion; 2) Corrosion + abrasion erosion; 3) Corrosion + abrasion erosion + high temperature above 420°C. Alth...
Claims
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IPC IPC(8): F16K15/03F16K31/12F16K27/00F16K25/04C22C37/06
Inventor 王枵天金志渊姚春玲廖志芳
Owner DAZHONG VALVE FACTORY ZHEJIANG PROV