III- Sealed Butterfly ValvesGYR-71500
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| GYR-71600 GYR-71600 have a face seal type, compact-structure, suitable process, easy made to be big size, self-washing function, little resistance modulus, offers high GY-value advantage etc. it’s served for adjusting of suspended particle fluid and density slurry oil fluid.
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| GYR-71700 Series GYR-71700 high performance double eccentric butterfly valve series, valve disc and valve seat have particular structure, therefore having excellent cut-off performance and endurance, a economic applied automatic control valve with two functions of adjusting and cut-off, small in volume, light weight, wide control range, easy maintenance. Actuator standard have Pneumatic Cylinder type, Electronic type, Electric Motortype.
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| GYR-71800 Series Butterfly Valve GYR-71800 high performance sealed butterfly valve series, new type of triple Eccentric sealed, at casing moment seal face is to seal face, little frictional force, long term performance, credibility seal can be bearing by bidirectional pressure, little moment when valve is opening-closing seal type is hard sealing. temperature-resisting type is common type and high temperature type.
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| IV- Control Valve for Cryogenic Service BEIER control valves for cryogenic service can get over the leakage main two condition of leakage: inner leakage and external leakage. The reason of valve’s inner leakage is that the seal pair have deformation in low temperature service. When the temperature of media felled to make material changed, and it’s changed in volume ,the seal surface have warpage from original high precision grinding, then that’s the case of sealing badness in low temperature. The new designed butterfly valve have been changed from plane seal to conical surface seal. Seat ring have a oblique cone oval sealing surface, with the circular resilient sealing ring wedged above the valve disc composed seal pair. Sealing ring can be floated in groove of disc. As valve shutdown, resilient sealing ring contacted with minor axis of elliptical sealing surface. along with turn of stem, progressive pulled sealing ring. Made resilient sealing ring contacted with major axis of oblique cone oval sealing surface. finally made resilient sealing ring full contacted with elliptical sealing surface. The sealing is depended on the deformation of resilient sealing ring. Thereby as it’s happened of body and disc deforming in low temperature. The deformation will be absorbed and compensated, It’s haven’t happened that case of leaking and over tightening. As valve is open, the resilient deformation will disappeared.
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