product description

The eccentric hemispherical valve is mainly used in the pipeline to cut off or regulate the flow of the medium. The valve is suitable for urban water supply, urban sewage, industrial sewage and other pipelines.

Technical Parameters

Nominal diameter: DN50~DN2000mm
Nominal pressure: PM0.6~4.0PMa
Use medium: water, sewage, steam, slurry, containing granular medium, etc. Normal temperature, medium temperature
Use temperature: normal temperature, medium temperature
Drive mode: worm gear drive, pneumatic drive, electric drive, hydraulic drive
Design Standard: Design and Manufacturing Standard GB/T26146 "Eccentric Hemispherical Valve"
                    Flange connection standard GB/T17241.6 "integral cast iron flange"
                    Structural length standard GB/T12221 "metal valve structure length"
                    Test and inspection standard GB/T13927 "Industrial valve pressure test"

Features

a. The eccentric structure is adopted. During the closing process, the ball gradually approaches the valve seat and completely contacts the closed position. When the ball is opened, the ball is completely disengaged from the sealing position, and the opening is not small, and the opening and closing is not
The friction ensures that the valve seat and the spherical cap do not rub against each other during the opening or closing of the valve.
b. The automatic compensation and sealing are reliable. The principle of eccentricity is used. The sealing surface is opened and closed without friction. The ball and the valve seat are tighter and tighter. When the sealing pair is worn for a long time, only the snail is adjusted.
The bolt can still achieve the effect of resealing when the sealing pair is worn to a certain extent, achieving a reliable seal and prolonging the service life.
c. Top-loading type and side-mounted type: The top-loading structure, the valve flap is loaded from the upper part of the valve. It is only necessary to open the valve cover to lift the valve flap for maintenance during maintenance, and it is not necessary to remove the entire valve from the pipeline. Side loading
The compact structure is suitable for occasions where the valve installation space is required.
d. Self-cleaning and shearing structure of the sealing surface: when the ball leaves the valve seat, the medium can wash away the accumulation of the sealing surface. For the easily crystallized medium or debris, the sphere can be crystallized during the closing process or
Cut off the debris to achieve the purpose of sealing, avoiding the disadvantages that other valves can not be switched;
e, tight sealing, using metal and non-metal two seals, the ball and valve seat are bimetal, adopt different processes, the sealing surface can be combined into anti-corrosion, wear-resistant and other types, non-metallic seals are wear-resistant and resistant.
Cold rubber, the valve seat has a diversion function to meet the needs of different working conditions, the seal is spherical contact, and the two-way eccentricity realizes zero leakage; the sealing test is performed according to the national standard GB/T13927
f. CNC machining: The metal sealing surface adopts advanced numerical control processing technology. The sealing surface is ground by separate and lap, which improves the surface roughness of the sealing surface and ensures the sealing effect of the valve.
g, large diameter valves above DN600 are equipped with support seats to facilitate anchor bolts to the foundation, so that the valve does not vibrate at high flow rates. Lifting rings are provided for easy installation and maintenance.