A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling fluid. A piston is moveable along an axis allowing movement of a valve poppet toward and away from the valve seat. The piston contacts a boot. A wax element is disposed in a chamber, such that the wax element expands as a temperature of the fluid to be cooled increases, and causes the valve poppet to move against the valve seat. The boot has wax separator structures. A bypass valve is also disclosed.

A thermostat for an engine cooling system may include a housing comprising a radiator-side flowing-in inlet for flowing-in coolant from a radiator side, a bypass-side flowing-in inlet for flowing-in the coolant bypassed from an engine, and a coolant flowing-out outlet for flowing-out the coolant to the engine side; and a main valve provided in the housing, and for opening and closing the radiator-side flowing-in inlet by a change in the volume of a wax. The direction in which the coolant flowed-in through the radiator-side flowing-in inlet presses the main valve and the direction operated to open the main valve are opposite to each other.

A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling fluid. A piston is moveable along an axis allowing movement of a valve poppet toward and away from the valve seat. The piston contacts a boot. A wax element is disposed in a chamber, such that the wax element expands as a temperature of the fluid to be cooled increases, and causes the valve poppet to move against the valve seat. The boot has wax separator structures. A bypass valve is also disclosed.

A thermostat valve includes a thermostat housing having engine-side and radiator-side coolant inlets that are opposed each other, a lateral coolant outlet leading to an internal combustion engine, and a valve disk. The valve disk has an end face that interacts with and faces a valve seat of the radiator-side coolant inlet. The valve disk lies between the radiator-side coolant inlet and a thermostat element arranged in the thermostat housing. The valve disk has, at the outer edge, a guiding element that includes a deflecting surface on the exterior side of the guiding element.

A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling the fluid. A bypass valve is mounted on a line to selectively bypass the fluid prior to reaching the heat exchanger. The bypass valve includes a valve poppet, a valve seat, a piston, a valve housing and a wax portion. A piston is moveable along an axis and allows movement of the valve poppet toward and away from the valve seat. The piston moves within a valve housing. A wax portion expands as a temperature increases, and causes the valve poppet to move against the valve seat. The wax portion cools if the temperature lowers such that the valve poppet moves away from the valve seat. There is a sealing surface on the valve poppet in sealing contact with the valve seat. The sealing surface is part-circular in a plane in which the axis lies. A bypass valve is also disclosed.

A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling fluid. A piston is moveable along an axis allowing movement of a valve poppet toward and away from the valve seat. The piston moves with a rigid seal carrier. The rigid seal carrier and the piston move within a valve housing. A wax element is disposed on an opposed axial side of the rigid seal carrier relative to a chamber, such that the wax element expands as a temperature of the fluid to be cooled increases, and causes the valve poppet to move against the valve seat. A bypass valve is also disclosed.

An apparatus for controlling the flow rate of engine coolant by use of a thermostat may include a thermostat arranged in an inflow flow path for the engine coolant and a flow rate regulator arranged in a bypass flow path for the engine coolant between a cylinder head of an engine and the thermostat. The flow rate regulator regulates the flow rate of the bypass flow path such that a differential pressure of the coolant between a front end for allowing the coolant flowing from a radiator to flow into the thermostat and a rear end for allowing the coolant to be discharged from the thermostat is within a predetermined range.

A thermostatic valve includes a valve body with a cavity provided therein, an end cover assembly, and a thermal actuator and at least one spring that are mounted in the cavity. The valve body is provided with at least three ports including a first port, a second port and a third port. The thermal actuator includes a valve rod and a main body. The spring includes a first spring. The cavity includes a first cavity and a second cavity, and the second cavity is away from the end cover assembly. The first port is in communication with the first cavity, and the third port is in communication with the second cavity. The first spring is partially or completely located in the second cavity. The thermostatic valve further includes a guide fitting part. The thermostatic valve has a simple structure, and the operation thereof is more stable and reliable.

Systems and techniques are described for using a connected device that measures water usage and controls temperature of a hot water line. In some implementations, a monitoring system monitors a property that includes one or more sensors located throughout the property and generates sensor data. The monitor control unit receives sensor data and based on the sensor data, determines an action that is likely to occur. Based on the action, determine a water temperature. Generate an instruction specifying the water temperature. The monitoring system includes a connected mixing valve that connects to a hot water supply line and a cold water supply line; receives the instruction specifying the water temperature; and, determines a first amount of hot water from the hot water supply line to combine with a second amount of cold water from the cold water supply line to produce water at the water temperature.

A thermostat includes a valve member. The valve member has an insertion hole. The insertion hole is constituted by a first protective member and a second protective member. A shaft of a jiggle valve extends through the insertion hole. The jiggle valve has a substantially spherical head connected to an end of the shaft. The head closes the insertion hole by contacting the peripheral edge of the opening of the insertion hole. The materials of the first protective member and the second protective member each have a Vickers hardness higher than that of the valve member, which is part of the valve member other than the protective members.