| 摘要 |
A desiccant filter of the spin-on type is provided with an aluminium cast baseplate (30) which has an aperture formed therein for receiving a pressure relief valve (96). The baseplate (30) is secured to a sheet steel canister (20) by a hemming connection which folds the end of the canister (20) around the rim of the baseplate (30). The inlet port (48) for receiving wetter air and the outlet port (46) for returning drier air are located in the baseplate (30). The inlet port (48) may be located inside the outlet port (46) or alternatively the outlet ports (46) may be located inside the inlet ports (48). A relief valve (96) is mounted in the aperture of the baseplate (30) to relieve excessive pressure build up in the filter and the air braking system. The pressure relief valve (96) includes a valve body (106), a compression spring (102) and a plunger (104). The valve body (106) includes an opening (116) and the plunger (104) includes plug (120) which extends into the opening (116) to prevent formation of a deposit area where water and other contaminants may be deposited. Regardless of whether the outlet port (46) is located inside the inlet ports (48) or likewise the reverse, the pressure relief valve (96) is always located in a position where it receives relatively dry air thereby better preventing the possibility of oil and water from freezing in the relief valve. The desiccant bed is compressed in a way that minimizes the amount of gaps between pellets and also minimizes the amount of rubbing between pellets thereby reducing the amount of desiccant dust produced. <IMAGE> |
