Valves and manifold applications

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	Aerospace Applications Rostra Vernatherm's thermostatic controls can control temperatures between the range of 30F to 300F and when applied to a valve, within a manifold it's function possibilities are vast. The images below are examples of a thermostatic valve paired with a specific 4 port directional manifold. The valve isolates two of the 4 ports when a specific temperature is reached, and opens all four when heat loss occurs. This process of opening and closing ports when temperature fluctuations occur is done without aid of any other power source, this valve is self powered, and never needs additional assistance to operate.
			A portion of this valve was cut away for viewing purposes, so we can explain it's function. In the picture to the left, notice the thermostatic valve inside of the housing. The valve is the object that has the spring attached to it. When the valve is installed into the housing it is wired according to aircraft standards to eliminate the possibility of unintentional loosening or removal caused by system vibration. The valve will extend closing the lower region of the housing preventing flow from bypassing the heat exchanger when the temperature increases. This will force fluid to flow through a cooling device, commonly referred to as a heat exchanger.
	When the system fluid is regulated the valve will automatically sense the fluid temperature and retract, thus opening the lower region of the housing. This will open a less restrictive path than that of the heat exchanger for the system fluid to flow through causing the fluid to bypass the heat exchanger. This process will only take place if proper pressure differentials are designed into the system. The valve will continue to function without the aid of any power source, ensuring proper system temperature regulation without having to worry about wires, and unreliable technology. The diagrams below visually explain the previous explanation.
	Figure 1: Open Valve The temperature of the system fluid is not in need of cooling, and the heat exchanger is bypassed, this occurs due to the pressure differential between flowing through the heat exchanger, verses flowing directly back into the system.

	Figure2: Closed Valve The temperature of the system fluid has reached the point where cooling is needed, and the valve has extended. When the valve extends it seats its self on the valve seat sealing off the lower region of the housing from the upper chamber. When the lower chamber is isolated the fluid has no other location to flow than through the heat exchanger to be cooled, and back through the sealed lower chamber of the housing and ultimately back into the system.

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