1. Basic definition
High-pressure gate valve is a cut-off valve specially used in high-pressure pipeline systems. Its opening and closing parts are gates. The movement direction of the gate is perpendicular to the flow direction of the fluid. It can only achieve full opening or full closing functions and does not have flow regulation capabilities. Its nominal pressure range is usually 10-80 MPa, and some ultra-high pressure scenes can reach more than 100 MPa.
2. Structure and design features
Gate type
Rigid wedge gate: formed by machining to form a fixed inclination angle, relying on the valve stem thrust to force sealing, suitable for high temperature and high pressure stable working conditions;
Elastic gate: The middle part of the gate is grooved to enhance deformation adaptability and reduce the risk of leakage on the sealing surface due to temperature or pressure fluctuations.
Sealing mechanism
Forced sealing design: Additional pressure is required to make the gate and the valve seat fit tightly when closing. The sealing surface is mostly made of iron-based chromium-nickel stainless steel surfacing or hard alloy coating to improve wear resistance and anti-scouring ability;
Valve stem seal: A combination of nitrided valve stem and flexible graphite filler is used to take into account corrosion resistance and high-pressure sealing.
Drive mode
Electric device control: Standard torque and stroke dual protection mechanism to prevent overload damage to the valve body;
Lifting rod structure: The open rod design intuitively displays the opening, and the dark rod design saves installation space.
3. Typical application scenarios
Energy industry: High-pressure cutoff of the main steam pipeline of thermal power plants and the cooling system of nuclear power plants;
Petrochemical industry: High-pressure oil and gas transmission pipelines, reaction medium control of alkylation units;
Industrial system: High-pressure water jet equipment, supercritical fluid (such as CO₂) transmission system.