The structure of the dome valve: dome valve seal structure, the special seal chamber in the condition of normal pressure seal and dome not contact, after charging - valve sealing effect. Sealing ring, elastic rubber material will be chosen to make inserts installed on the dome Industrial Valves body, sealing gas source can be a 5 mm cylindrical hole connected to the seal chamber. core adopts spherical dome, the body and the contact area of processed into spherical valve core, about 1 mm gap in cooperation. core is fixed on the shaft pin and crank connected, by means of the actuator is connected to the crank dome Industrial Valves switch. Dome valve need to be closed, spherical dome rotating upward to the first and the mouth center vertical position, the gas filling of online leak sealing to seal cavity, seal compression, expansion and dome close contact, achieve sealed shut down; Dome valve need to open, to bring the sealed cavity pressure gas emissions into the atmosphere, become normal pressure seal chamber pressure, sealing ring natural contraction, and cooperate with the dome of the seal gap of about 1 mm, the crank turns the dome, 90 °, the valve opens. Dome Industrial Valves features: the use of the site use, blowing tank pressure to atmospheric pressure, the dome valve no pressure difference can only be opened from top to bottom, otherwise the valve movement, the pulverized coal in the differential drive rapid scouring the sealing ring and the dome valve core, will accelerate the valve wear; Seal chamber pressurized pressure of 1. 6 mpa, injection can of maximum working pressure is greater than 1. After 4 mpa, otherwise the pressurized sealing ring cannot completely, can not meet the sealing effect, caused the seal between the dome and clearance and coal powder leakage. Dome valve is often used in the gas solid two phase injection or conveying pipes and tanks, cut off or shut down function. Dome valve seal chamber atmospheric pressure, the dome valve core and valve body, sealing ring does not contact, dome valve switch action will not wear and tear on the parts [ 1] ; Seal chamber after pressurized sealing ring expansion seal, residual powder on the dome squeezed inside the sealed spherical flow to prevent wear of sealing ring and body; Dome valve sealing ring embedded installed on the valve body, is the only contact with the dome valve core components, even appear wear away, easy disassembling maintenance [ 2] ; Sealing contact area and dome in the long-term production there will be a slight wear and tear, but after pressurized seal cavity, the expansion of the sealing ring will automatically compensate the wear volume, so the dome valve wear limit is bigger than any other type of valves are many, the sealing effect is better, longer service life. Pneumatic dome valve installation using the point 1) Read this manual carefully before installation, and check the valve type, size and technical parameters. 2) It is strictly prohibited to mount the valve after welding flange, to avoid damage to the valve seal. Pipeline valve installation distance should be adapted to first reserve, on both sides of the flange gasket. 3) Two pipe center center should maintain coaxial with the valve size and flange face should level off, do not allow the large deflection of the flange surface, to guarantee the normal work of the valve clamping and. Tighten bolts should be uniform. 4) The valves have been doing before delivery adjustment and dynamic test, gas path is connected in good condition. 5) The main wearing parts for sealing ring and valve core. More 'valve technology please see pump valve net: http://www. zgbfw。 com/news/technology。 aspx
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