The Russian standard gate valve is usually suitable for the condition that does not need to open and close frequently, and keeps the gate fully open or fully closed. Not intended for use as a regulator or throttle. For high speed flow media, the gate vibration can be caused when the gate is partially opened, and the vibration may damage the sealing surface of the gate and valve seat, and the throttling will cause the gate to be eroded by the media. From the structural form, the main difference is the form of the sealing element used.
Overview of the two main components of the Russian standard gate valve:
Valve body assembly and actuator assembly (or actuator system), divided into four series: single-seat series control valve, two-seat series control valve, sleeve series control valve and self-operated series control valve. Variations of the four types of valves lead to a wide variety of applicable configurations, each with its own specific applications, characteristics, advantages and disadvantages. Although some control valves have a wider range of application conditions than others, but the control valve is not suitable for all conditions, please contact our control valve sales engineers, together to build the best solution to enhance performance and reduce costs. Cast steel Russian standard gate valve is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium from the lower part of the disc into the valve, the operation force needs to overcome the resistance, Russia standard gate valve is the stem and packing friction force and the thrust produced by the pressure of the medium, the force of the valve is larger than the force of the open valve, so the diameter of the stem is larger, otherwise the failure of the stem top bending will occur.
In recent years, from the appearance of the self-sealing valve, the medium flow of the Russian standard gate valve is changed from the upper part of the disc into the valve chamber, then under the action of the medium pressure, the force of the valve is small, and the force of the valve is large, the diameter of the stem can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tight. The flow of Russian standard gate valves is from top to bottom. The valve shall be installed horizontally.
What are the specific standards of Russian standard valves?
A valve must comply with multiple standards, some general, some special.
For example, pressure resistance, temperature resistance, size, construction, marking, material, connection and so on have their own standards. Each standard is also based on industrial, civil, Marine, power plant, nuclear industry, fire protection, and so on. There are hundreds of standards related to valves in China.
So can only according to need, want to know which technical index, go checking relevant standard again. The working principle of the Russian standard valve is the same as the national standard, but the design standard is not the same, other basic are similar, by the rotation of the stem, to open and close the gate!
Post time: Mar-24-2021