Introduction To The Working Process Of Forged Steel Stop Valve

Due to its unique structure, the forged steel stop valve has several unique advantages, such as frictionless switching, wear-free seals, and smaller opening and closing torque. Reduce the size of the actuator. Equipped with a multi-turn electric actuator, the medium can be adjusted and closed.

The forged steel stop valve is a forced sealing valve, so when closing the valve, pressure must be applied to the valve disc to prevent leakage from the sealing surface. When the medium enters the valve from below the forged steel stop valve disc, the resistance that the operating force must overcome is the friction between the valve stem and the packing and the thrust generated by the medium pressure. Since the valve is greater than the force to open the valve, the diameter of the valve stem must be increased. Otherwise, the valve stem will bend and fail. The forged steel stop valve is a forged steel stop valve with a plug-shaped valve disc on the opening and closing, a flat or conical sealing surface, and a valve disc that moves linearly along the center line of the fluid.

Forged Steel Globe Valve changes to the direction of entering the valve cavity from above the valve disc. At this time, due to the effect of the medium pressure, the force to close the valve is very small, and the force to open the valve is very small. The valve is larger, and the valve stem diameter can be reduced accordingly. At the same time, under the action of the medium, this type of valve also becomes tighter. Horizontally installed stainless steel glove valve. When the stop valve is opened, the valve disc opening height is 25% of the nominal diameter, and the flow rate reaches the maximum, indicating that the valve is fully open. Position. Therefore, the full opening position of the forged steel stop valve must be determined by the stroke of the valve disc.

Selection principles of forged steel stop valves:

1. Small valves include needle valves, instrument valves, sampling valves, pressure gauge valves, etc.

2. There is flow regulation or pressure regulation, but the regulation accuracy is not high, and the pipe diameter is relatively small. For example, you should choose a pipe with a nominal diameter of 50 mm or less.

3. High-pressure angle valves or throttle valves with a nominal pressure of PN160, a nominal pressure of 16MPa or PN320, and a nominal pressure of 32MPa must be used for large and small fertilizers in synthetic industrial production. High-pressure angle valves or throttle valves. Pressure 32MPa.

4. Stop valves should be used for high-temperature and high-pressure medium pipelines or equipment. Thermal power plants, nuclear power plants, high-temperature and high-pressure pipelines in petrochemical systems, etc.

5. Pipelines with loose flow resistance requirements. In other words, it is a local area where pressure loss is rarely considered.

6. For the desiliconization workshop and simple coking pipeline in the alumina procurement process, a DC stop valve or a DC throttle valve is selected, the valve body is separated, the valve seat is removable, and the hard alloy is a pair of alloy seals.

7. For water supply and heating projects in urban construction, for pipes with smaller nominal diameters, such as pipes with a nominal diameter of less than 150mm, stop valves, balancing valves or plunger valves can be selected.