A hybrid multi-air conditioning system and a method for controlling a hybrid multi-air conditioning system are provided. The hybrid multi-air conditioning system may include a hot water supply unit including a hot water supply heat exchanger that exchanges heat between refrigerant and water accommodated in a water tank and a first hot water supply expansion valve that blocks or allows refrigerant condensed in the hot water supply heat exchanger to flow through a first hot water supply discharge pipe; at least one indoor device installed indoors and including an indoor heat exchanger and at least one indoor expansion valve; an outdoor device connected to the at least one indoor device and the hot water supply unit through a refrigerant pipe and including an outdoor heat exchanger, a compressor, and an outdoor expansion valve; a second hot water supply discharge pipe having a first side branched from the first hot water supply discharge pipe, which connects the hot water supply heat exchanger and the indoor heat exchanger, and a second side that joins a first discharge pipe, which connects the compressor and the outdoor heat exchanger; and a second hot water supply expansion valve installed on the second hot water supply discharge pipe.

The system includes: a heat pump unit; a hot water supply heat exchanger; heating heat exchangers; a pump; heat medium pipes that connect a discharge side of the pump, the heat pump unit, the hot water supply heat exchanger, the heating heat exchangers, and a suction side of the pump in order; a first bypass pipe that bypasses the hot water supply heat exchanger from the heat medium pipe; a second bypass pipe that bypasses the heating heat exchangers from the heat medium pipe; a four-way valve that regulates flow distribution of the heat medium between the hot water supply heat exchanger and the first bypass pipe 22, and between the heating heat exchangers and the second bypass pipe; and a control unit for controlling the four-way valve in accordance with a hot water supply request and a heating request.

The disclosed technology includes an on-demand water heater which uses a heat pump to heat the fluid. The on-demand heat pump water heater can have a low fluid capacity heating chamber which has an inlet and an outlet, a heat pump for heating the fluid, and a controller to control the heat pump and maintain the temperature of the fluid at a predetermined temperature. The on-demand heat pump water heater can include one or more temperature sensors, flow sensors, fluid mixing valves, or supplemental heat sources.

A plumbing system pressure protection valve assembly that utilizes a unitary body to connect a hot water tank to a cold water supply, a vacuum breaker, and an expansion tank. The assembly includes two ball valves coupled to the unitary body to isolate the hot water tank from the cold water feed and to isolate and permit draining of the expansion tank. The assembly also includes a rod and foot coupled to a tab on the unitary body to provide support for the expansion tank service valve assembly.

A valve device includes: a case having a valve chamber and first to third water communication ports communicating with the valve chamber; first and second valve bodies disposed in the valve chamber; and a shaft body connected with the first valve body. The first valve body is rotated about a central axis of the shaft part. The second valve body is rotated about the central axis together with the first valve body. When rotated about the central axis in a first angle region, the first valve body changes a first flow rate, i.e., a flow rate of water between the first and third water communication ports, and a second flow rate, i.e., a flow rate of water between the second and third water communication ports. When the first valve body is rotated about the central axis in a second angle region, the second valve body changes the second flow rate.

A valve assembly capable of indicating a depth contains: a body includes a holder. The holder includes a cold-water inflow connector, a hot-water inflow connector, a first outflow connector, and a second outflow connector. The cold-water inflow connector has a cold-water inflow seat configured to connect with a cold-water inflow pipe, and the hot-water inflow connector has a hot-water inflow seat configured to connect with a hot-water inflow pipe. The holder further includes a first coupling portion and a second coupling portion. The positioning plate includes the opening for fitting with the holder, a first fixing portion formed around the opening, a second fixing portion formed around the opening, and at least two recesses arranged around the opening, wherein the first fixing portion is configured to connect with the first coupling portion, and the second fixing portion is configured to couple with the second coupling portion.

A fluid transportation network (1) comprises a plurality of parallel zones (Z1, Z2), fed by a common supply line (L), with a regulating zone valve (V1, V2) in each zone (Z1, Z2) for regulating a flow of fluid (.sub.1, .sub.2) through the respective zone (Z1, Z2). A processing unit (RE) receives valve positions (pos.sub.1, pos.sub.2) of the regulating zone valves (V1, V2) and determines and sets an adjusted valve position for a line valve (VE) arranged in the supply line (L), depending on the valve positions (pos.sub.1, pos.sub.2) of the regulating zone valves (V1, V2). A processing unit (RE) further receives a measurement of a total flow of fluid (.sub.tot) through the supply line (L) and determines and sets adjusted valve positions for the regulating zone valves (V1, V2), depending on the measurement of the total flow of fluid (.sub.tot) through the supply line (L).

A heating or cooling installation control valve includes a movable valve element which is arranged in a valve space (8), as well as at least two connection channels (24, 26) which each have a first end in fluidic connection with the valve space (8) and have an opposite second end (A, B) for connection to a fluid-leading component. A sealing element (18) is arranged in at least one of the connection channels (24, 26) at a first end thereof. The sealing element is in contact with the valve element (6). The at least one connection channel (24, 26), in which the sealing element (18) is arranged, in addition to the second end (A, B), includes an assembly opening, through which the sealing element (18) can be inserted into the connection channel (24) and removed from of the connection channel (24).

A hydraulic system includes at least one pump assembly and a switching device which includes at least two switch positions. The switching device is configured such that on operation of the pump assembly in a first operating condition, the switching device is held in a stable manner in each of the at least two switch positions in each case by the hydraulic forces in the system. In a second operating condition of the pump assembly, the switching device is moved from a first switch position into a second switch position, assisted by switching energy stored in the first operating condition. The hydraulic system is configured such that in the first operating condition, the switching energy is stored independently of a switching-over of the switching device between the switch positions. A method is provided for operating such a hydraulic system.

A valve is provided for flow regulation in a heating and/or cooling system. The valve includes a first valve unit with a first valve element and a second valve unit with a second valve element. The first valve unit and the second valve unit each have three valve ports. The first valve element and the second valve element are arranged in a common valve housing and the first and second valve elements fluidically couple, in a first valve element position, a first valve port to a third valve port and, in a second valve element position, couple a second valve port to the third valve port. The first valve element and the second valve element are movable together by an actuating apparatus into the first valve element position or the second valve element position. In addition, a system for heating and/or cooling including the valve is provided.