The h-type thermal expansion valves for auto air-conditioners are such valves which expand on heat by interiorly temperature sensing and exteriorly balancing. The feature a sensitivity and reliability in temperature sensing, firmness against the pressure dropping-down with the evaporator, vibration resistance, easiness of regulating, etc. Apart from reference to American, Japanese and other international auto standards, our qrfwh serial expansion valves also represent advanced technologies and special characteristics. Key specifications/special features: * international and domestic advanced sealing structure in the balancing part (patent number: zl96120084.7) * advanced technology for the steel ball sealing of the bellos (patent number: 02137156.3) * advanced negative static overheat technology (patent number: zl02257444.1) * top sensitive of regulating * steady regulation with small fluctuation * little leak in the balancing part * the bellows works reliably with no leak * no whistle noise * long service life.
