Mandatory seal the necessary condition is that the media Thanksgiving and operating force, the sealing surface can still maintain a certain pressure of the non-Genuine. It should be emphasized that in a forced seal, the media pressure tends to reduce the pre-tight seal pressure to lower the seal performance. The typical structure of forced seal is flat pad seal, wound pad seal and toothed pad seal. Usually used for low pressure, medium pressure and small diameter of the valve. (2) Prior to self-tightening of the valve, tighten the bolts to raise the valve cover so that the initial sealing condition between the bonnet and the wedge seal and between the valve body and the wedge seal - on the sealing surface The preload than the pressure. When the media pressure rises, the valve cover by the media pressure, moving up, the valve cover and the wedge seal, and the valve body and the wedge seal between the seal than the pressure, increasing with increasing pressure. In the self-tight seal, the sealing surface of the working pressure than the pressure from the synthesis of two parts: First, pre-tight than the pressure seal, the second is the media pressure formed by the pressure. It should be emphasized that: Self-tight seal, the medium pressure tends to increase the pre-tight seal than the pressure to increase the sealing performance. The higher the media pressure, the greater the work pressure ratio, the more sealing performance. According to this feature, since the tight seal as a high-pressure sealing technology, commonly used in high temperature, high pressure large diameter control valve. Self-tight seal in accordance with the media pressure acting on the gasket in the direction of force, but also can be divided into axial self-tight seal and radial self-tight seal. Self-sealing axial wedge pad seal (Wood Seal), wedge seal, flat pad self-tight seal, C-ring seal and O-ring seal. Radial self-tight seal with a double cone seal, B-ring seal, triangular pad seal, octagonal ring (oval ring) seal and lens pad seal.
Turbine Hard High Speed Door
Hard turbine speed door: set energy-saving insulation and efficient wind environmental seal in a new metal industrial doors , opening speed of up to 1.5meters per second , For applications that require frequent rapid opening of the logistics channel , Insulation thickness 0.7mm aluminum door intermediate polyurethane foam , total thickness 40mm door wide 185mm per meter weight 1.63KG, Having good thermal insulation and light weight impact strength and other characteristics , wind rating of greater than 12 and theft , The door is suitable for indoor and outdoor fast-track logistics and production , The door type for enterprises save a lot of energy due to air flow generated loss than ordinary industrial sliding doors shutter doors save energy about eighty percent , Rapid opening and closing of the door so that enterprises in the rotational speed of the production and logistics of the door is greatly improved enterprise logistics and production must pass through the channel selection and its use is directly related to the efficiency of production and logistics , This product has high reliability , practicality and easy operation and quick fix for me , Drive control using a stable energy-effcient and accurate hard to guarantee fast and reliable operation of the door system the door to ensure trouble-free operation every year more than 250,000 times
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SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfarrs.com