Fire control valve body surface leakage? Installed in the central air conditioning duct system, the working principle is the use of valves installed on the fusible alloy temperature control, the use of gravity and the role of spring mechanism, when a fire occurs, the flame Invade the air duct, high temperature to melt the valve on the fusible alloy, or make the deformation of the memory alloy so that the valve automatically shut down for the air duct and fire partition through the occasion.

General fire control valve installed in the duct through the firewall and structural deformation joints, fire control role, you can set the output signal, the temperature exceeds 70 ℃ or 280 ℃ when the valve is closed, the linkage send (make) fan closed.

Leakage at the valve body surface Leakage at the valve body surface Leakage at the junction between the upper and lower valve body causes the leakage mainly due to the following:

First, the binding surface of the bolt tightness or tight side, resulting in poor sealing surface. Elimination method is to adjust the bolt tightness, the tight bolt must be diagonally tight manner, it is best to measure the gap around the edge of the tight bolt will not move so far, and to make the gap around the junction Consistent.

Second, the valve body with the tooth surface seal does not meet the standards. For example, the radial seal groove slightly grooved, poor parallelism, tip too sharp or over-the-slope and other defects can cause seal failure. So that the valve body surface leakage. In the maintenance of good spare parts quality, the use of standard toothed gaskets can avoid this phenomenon.

Third, the valve body (fire damper) with the flatness of the surface is too poor or hard impurities caused by padding seal failure. The valve body due to the flatness of the joint surface caused by poor bonding surface leakage, the elimination of the valve is to disintegrate the valve to re-ground the joint until the quality standards. As a result of impurities caused by gasket failure seal in the valve assembly carefully clean the surface to avoid impurities fall into.

Construction Hoist Part

Construction hoist is vertical transport machinery driving by pinion and rack, mainly used on construction site for transportation of personal and materials. As a permanent or sub-permanent external elevator, it also applies to store house, dock, high tower, high chimney, etc.

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