V-type high-temperature negative electrode ball valve, high-temperature negative electrode valve serve industries including: energy, petrochemicals, metallurgy, chemical engineering, mining, papermaking, environmental protection, biochemicals, pharmaceuticals, petroleum, power, printing and dyeing, light industry, food, tobacco, sugar production, beverages, and various other fields.
I. Introduction to V-type High-Temperature Negative Electrode Ball Valve, High-Temperature Negative Electrode Valve
The V-type high-temperature negative electrode ball valve, high-temperature negative electrode valve is a type of ball valve. Its closing element is a hemisphere with a V-shaped opening. The V-shaped opening has a sharp edge, and during the rotation of the ball, the closing elements have a wiping effect, providing strong cutting force to the medium. The V-shaped opening of the ball and the flow passage of the valve seat form a fan-shaped area. During rotation, the cross-sectional area of the flow passage can be changed, enabling precise regulation of the medium. It is an angular rotation control valve with sealing performance equivalent to that of a standard ball valve, allowing it to perform both regulating and shut-off functions. When paired with pneumatic or electric actuators, it is widely used in industrial process automation systems.
II. Product Features of High-Temperature Negative Electrode Ball Valve, High-Temperature Negative Electrode Valve
1. Integral valve body structure: Both wafer-type and flanged V-type ball valves feature an integral side-entry structure, providing strong structural rigidity that minimizes deformation and leakage.
2. Upper and lower self-lubricating bearings: The valve body is equipped with upper and lower self-lubricating bearings, which have a large contact area with the valve stem, high load-bearing capacity, and a low friction coefficient, reducing the valve's torque.
3. Valve seats can be selected as metal hard seals or PTFE soft seals based on medium and working conditions: Metal hard seal valve seats have hard alloy surfacing on the sealing surface, with the ball surface hard chrome-plated or treated with spray welding, ion nitriding, etc., to enhance the service life of the sealing surface and improve temperature resistance. Soft seal PTFE or reinforced PTFE valve seats offer excellent sealing and corrosion resistance, with a wide range of applications.
4. Economic practicality: The valve body is lightweight, the valve stem torque is low, and the required pneumatic or electric actuators are correspondingly smaller in size. Compared to other types of control valves, it offers high cost-effectiveness.
5. Wide range of medium compatibility: Due to the shearing effect between the V-shaped opening and the valve seat, and the smooth, rounded flow passage inside the valve, the medium is less likely to accumulate in the cavity. Therefore, it is suitable not only for liquid media but also for systems with fibrous and solid particle media.
6. Precise control of low flow rates: By machining special V-shaped openings on small-sized valve cores, precise control of low Cv values can be achieved.
III. Design Standards for High-Temperature Negative Electrode Ball Valve, High-Temperature Negative Electrode Valve
1. Flange standards: GB/T 9113.1-2010, JB/T 79.1-1994, HG 20592-2009, ASME B16.5, EN 1092-1:2001
2. Pressure-temperature ratings: GB/T 12224-2007, ASME B16.34-2003, ISO 7005-1
3. Structural length standards: Wafer-type: Enterprise standard; Flanged: ISA S75.04-1995, IEC/DIN 534-3-2
4. Applicable temperature range: -29°C to 150°C (normal temperature type), -29°C to 250°C (medium temperature type), -29°C to 350°C (high temperature type)
5. Sealing and strength testing standards
Strength and sealing test standards: GB/T 4213-2007
Hard seal grade: Unless otherwise specified by the user, the following table standards apply. If required by the user, it can be executed according to GB/T 4213-2007 Grade V standards. Strength test pressure is 1.5 times the nominal pressure. Sealing tests for the packing and flange are conducted at 1.1 times the nominal pressure. Valve seat sealing is tested based on the maximum operating differential pressure. If the maximum operating differential pressure is unclear, testing is performed at 1.0 MPa (water pressure). If the maximum differential pressure is less than 0.6 MPa, testing is conducted at 0.6 MPa. The test medium is water with corrosion and scale inhibitors.