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Structure and application of vacuum globe valve
Vacuum globe valve for nominal pressure PN4.0 ~ 10.0Mpa, working temperature ≤ 200 ℃ thermal power plant backwater condensing system pipe, cut off or connected medium. Applicable medium: water, steam and so on. Structural features: Vacuum globe valve according to JB / T3595 standard design and manufacture, to meet the power plant equipment supporting the use of requirements. Design vacuum packing structure chamber, isolation and reliable vacuum. Stem by the quenched and tempered surface nitriding, have good corrosion resistance, abrasion and abrasion resistance. Flange gasket composite material, the expansion coefficient, airtight, and ensure the system isolated from the atmosphere and reliable. Inverted seal with stainless steel threaded seal seat or body made of welded austenitic stainless steel, inverted seal and reliable. Filler replacement and maintenance can be carried out without downtime, convenient and does not affect the operation of the system. Uses: The main body of vacuum isolation shut-off valve adopts cast-forged structure, with parallel double seal half semi-forced two-way seal, sealing surface in-place movement and wedge wedge tight movement step effect, to achieve zero leakage. Friction coefficient between the sealing surface is small, easy to close, and sealing surface wear automatic compensation. Simple structure, compact, easy maintenance, long service life. The valve cover packing room is provided with a vacuum sealing mechanism, which has the function of self-inflating the pressing metal, and the connecting surfaces are sealed with high-strength expansion materials to isolate the system from the atmosphere and have good vacuum sealing performance. Vacuum globe valve connection form is divided into flange connection, welding connection two kinds, the driving mode is manual, electric two kinds. Vacuum cut-off valve is suitable for working temperature ≤ 425 ℃ and ≤ 550 ℃, the working medium is water, air, steam pipe, as the closing device. Especially suitable for thermal power plant steam condensing and vacuum system, play a vacuum seal isolation.