discharge valve

discharge valve

Corrosion resistance: 1. Use medium such as water, acetone, alcohol, ammonia, barium carbonate, benzene (the temperature of wcb material is -29℃-425℃).

2. Use medium such as particles, oil, pulp, carbon dioxide gas (stainless steel material can be used at -60℃-232℃). 3. It is strictly forbidden to use fluorine-containing ionic liquids (such as hf, etc.) nor strong alkali and phosphoric acid (temperature less than 150℃, concentration>30%). 4. The general working temperature of stainless steel is less than or equal to 150℃, and the pressure range is 0.6-2.5mpa. If it exceeds this requirement, please specify when ordering.

Easy to operate, open freely

The difference between the upside-down and downside-down

discharge valve

Performance and use

Easy to operate, free to open, flexible and reliable movement; easy to assemble and maintain the valve disc, reasonable sealing structure, convenient and practical to replace the sealing ring.

Structure: It is mainly composed of valve body, valve disc, sealing ring, valve stem, bracket, valve gland, handwheel, flange, nut, positioning screw and other parts. This type of valve should generally be installed horizontally in the pipeline.

Nominal diameter dn, rated flow coefficient kv of discharge valve, nominal pressure and differential pressure of discharge valve, material of discharge valve body and valve components, flow characteristics of discharge valve, applicable temperature of discharge valve, power supply voltage of discharge valve and control signals, whether the discharge valve has accessories, etc.

Nominal diameter

(nominaldiameter), also known as mean outer diameter (meanoutsidediameter), represents the symbol dn, which is the general diameter of various pipes and pipeline accessories. Pipes and pipeline accessories of the same nominal diameter can be connected to each other and are interchangeable. It is not the outer diameter or inner diameter of the pipe in the actual sense, although its value is close to or equal to the inner diameter of the pipe, in order to make the connection size of pipes and fittings uniform , using the nominal diameter (also known as nominal diameter, nominal diameter). For example, welded steel pipes can be divided into thin-walled steel pipes, ordinary steel pipes and thickened steel pipes according to thickness.

Its nominal diameter is neither the outer diameter nor the inner diameter, but a nominal size that approximates the inner diameter of ordinary steel pipes.

Each nominal diameter corresponds to an outer diameter, and its inner diameter varies with thickness.

The nominal diameter can be expressed in metric mm or in imperial in.

Pipeline accessories are also expressed by nominal diameter, which is the same as seamed pipe.

Nominal pressure

(nominalpressure), indicating the symbol pn, the maximum working pressure allowed when applied at a certain temperature. When the working temperature increases, the pressure resistance of the valve body will decrease. For example, a carbon steel control valve with a nominal pressure of 6.4mpa (pn64) has a pressure resistance of 5.2mpa at 300°C, 4.1mpa at 400°C, and 2.9mpa at 450°C .

Body Material

Cast steel, stainless steel, 316l. The working pressure is 0.6-2.5mpa, and the working temperature is -20℃-425℃. The valve diameter is dn25-dn300. Connection: Flange.

Oils, acids, corrosive media, etc.

Manufacturing standard: GB.

The discharge valve capacity is mainly used for bottom discharge, discharge, sampling and no dead zone shut-off operations of reactors, storage tanks and other containers. The bottom flange of the valve is welded to the bottom of the storage tank and other containers, thus eliminating the residual phenomenon of the process medium usually at the outlet of the valve.

According to the actual needs of the discharge valve, the bottom structure is designed as a flat bottom type, the valve body is a V type, and two working modes of lifting and lowering of the valve disc are provided. The inner cavity of the valve body has an erosion-resistant and corrosion-resistant sealing ring, which can protect the valve body from being washed and corroded by the medium at the moment of opening the valve, and the sealing ring is specially treated to make the surface hardness reach hrc56-62, with high wear resistance, Corrosion-resistant function, the cover of the valve disc seal is surfacing with hard alloy when needed, and the sealing pair adopts wire seal to ensure the reliability of the seal and prevent scarring. At the same time, the design of short stroke valve disc is adopted.

Main equipment performance

Discharge valve: The glass-lined equipment is a vitreous glaze with high silicon content. It is made by coating the metal tire at a high temperature of about 900 degrees. It has good mechanical properties and corrosion resistance, can prevent the substitution of media and metal ions to affect the pollution of products, and the surface is smooth, wear-resistant, and has a certain thermal stability. In addition to phosphorus and phosphorus light medium, hydrofluorocarbon, hydrochloric acid, sodium hydroxide, potassium hydroxide, this valve can resist various acids, alkalis, salt solutions and organic solvents. a. Corrosion resistance: 1. It can resist general inorganic acid, organic acid, weak alkali solution (p≤60℃ph≤12) and organic agent medium. 2. It is better than stainless steel in strong corrosive media such as hydrochloric acid, nitric acid, etc. It is strictly forbidden to use fluorine-containing ionic liquids (such as hf, etc.), nor strong alkalis and phosphoric acid (temperature less than 150 °C, concentration >30%). b. Heat resistance, it is allowed to be used between -30°C and 240°C (temperature resistance is less than 120°C). c. Has a smooth surface. Not easy to stick materials, easy to clean. e. Insulation: The impact resistance is as small as 2500 g/cm, so the impact of hard objects should be avoided during use.

Performance and use

Construction and installation points

1) The installation position, height, and direction of import and export must meet the design requirements, and the connection should be firm and tight.

2) For all kinds of manual valves installed on the thermal insulation pipeline, the handle shall not be downward.

3) Visual inspection must be carried out before the valve is installed, and the nameplate of the valve should meet the requirements of the current national standard “General Valve Mark” gb12220. For working pressure greater than 1.0mpa

And the valve that plays the role of cutting off the main pipe should be tested for strength and tightness before installation, and it is allowed to be used after passing the test. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve housing and packing should be qualified without leakage.

In the tightness test, the test pressure is 1.1 times the nominal pressure; the test pressure should meet the requirements of the GB50243 standard for the duration of the test, and the sealing surface of the valve disc is qualified if there is no leakage.

The valve is easy to operate, free to open, flexible and reliable in movement;

Simple valve assembly and maintenance,

It is convenient and practical to replace the sealing ring.

Structure and Principle

(1) valve body, (2) bracket, (3) handwheel: cast iron

(4) Spool: stainless steel

(7) Packing: PTFE sealing ring

The structure of the discharge valve is shown in the figure, it is suitable for the glass-lined discharge valve with design pressure p≤0.6mpa and working temperature t≤1500c.

The technical conditions of the valve should meet the requirements of hg5-16-79.In addition to phosphorus and phosphorus light medium, hydrofluorocarbon, hydrochloric acid, sodium hydroxide and potassium hydroxide, this valve can

Resistant to various acids, alkalis, salt solutions and organic solvents

The difference between the upside-down and downside-down

Opening and closing itinerary

The opening and closing strokes are different, and the installation size has a small opening and closing stroke and a small installation height. The structure of the rotating rod has a small installation height, and the plunger only rotates during the opening and closing process. It should judge the opening and closing and position of the valve according to the opening and closing position indicator.

1. The upward unfolding discharge valve is opened by the upward movement of the valve disc. When opening, the valve needs to overcome the force of the medium, and the opening torque is larger than the closing torque.

2. The downward-spreading and plunger-type discharge valves open the valve by moving the valve disc (plunger) downward. When opening, the moving direction is the same as the force of the medium, so the opening torque is smaller than the closing torque.


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