Q: common air conditioning four-way valve fault judgment and analyze the way of answer: 1, the four-way valve gas channeling identify start working compressor and four-way valve reversing, at the same time with the hand touch the four-way valve E, S, C three receive and manage, if three receive and management are fever, confirm the four-way valve reversing did not reach the designated position. 2, air conditioning can not be accurately and properly from cooling to heating or from heating change into refrigeration, this kind of thing is four-way valve can not be normal commutation failure, mainly comprised the following: 1) Electromagnetic coil destroyed, pilot valve failure; 2) Four-way valve valve slide the system within the inner goods ( Oxygen skin, sundry, deteriorating grease) Such as jam or stick, a small group can use sticks or glue stick tap four-way valve body to solve; 3) The body is impacted by the external force to destroy ( The valve body concave) Cause the slide valve can not reversing, judging from the appearance; 4) Because the system inside the liquid impact the disconnection Industrial Valves slide guide frame, end cover damaged variant, there's no way to reverse; With daikin and sanyo believing scroll when big proportion of the initiation of the liquid impact, 5) Four-way valve inside gap is too large, the seat welding tiny burn out when the leak amount exceed standard, lead to collusion, make the pressure balance valve at both ends and there is no way to push the slide valve commutation; 6) Four-way valve main slider broken system pressure, cause the main slider can not reverse; 7) Pilot valve lumen dirty plugging, causing the pilot valve can not office; 8) From system to system comprised of main slider is in the body when the phone is switched on halfway, energized the pressure difference on both ends there is no way to set up, cause you can't reverse; This kind of failure is a small group of after beating body and add refrigerant filling can be solved; 9) System has a slow leak, cold media is less, can not establish the reversing the pressure difference between the demand; 3, four-way valve body, capillarity or solder joints have leaked refrigerant ordinary body appearance has many oil, TuShangYang alkaline in the body appearance, if have bubbles, initiation, explain it leaked refrigerant, if the valve body, capillarity or capillarity welding have bubbles, demand change four-way valve, if be in, E, S, C, or D tube flaring has bubbles and initiation, can be solved after repair welding; 4, four-way valve, directional control is the basic condition of differential pressure at the ends of the piston ( F1 - F2) Must be greater than the friction resistance f, otherwise, the four-way valve will not be reversing. Reversing the minimum movement differential pressure is guaranteed by system flow. When the pressure difference between the pistons ( F1 - F2) Large Marine valve f friction resistance, four-way Industrial Valves reversing, when the main valve movement to the middle position, the four-way valve E, S, C three receive and manage each conduction, refrigerant compressor discharge from four-way valve D receive and management directly via E and C to receive and to receive and management (S Compressor back to port) , to lower pressure difference rapidly, forming the instantaneous air condition ( Middle traffic conditions) 。 Ordinary system default for the compressor shut down after a certain period of time only reversing four-way valve, high and low pressure tends to equilibrium, the reversing to the middle position was resting, namely the four-way valve reversing does not reach the designated position, the main stop valve in the middle position, next time to work, because the middle flow utility to flow is not enough 4) Compressor start work flow is not enough, when the frequency converter is superficial; 。 At this point, if the compressor exhaust flow long term in the middle of four-way valve flow, can set up a big enough directional pressure difference and make the four-way valve reversing in place; On the other hand, if the compressor exhaust mind less than the middle of four-way valve flow, the four-way Industrial Valves reversing the minimum required action pressure difference can not be set up, namely the F1 - F2 1) The leaking air conditioning system, lead to inadequate system refrigerant circulation, add refrigerant solution; 2) When the weather is very cold, cold media evaporation capacity is not enough, add refrigerant solution; 3) Empty transfer to time. 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