Three Port Thermostatic Control Valves maintain the proper operating temperature within a system thanks to exclusive aerospace technology used for accurate temperature control. These valves are powered by non-electric thermal actuators which are designedfor each customer's specific function needs. These valves are activated by a selected & preset temperature range from 30F to 300F.
Typically these valves are installed onsystems where thermal management is needed.These valves are usually installed in-line with a heat exchanger and they divert fluid to be cooled when needed,when cooling isn't needed the valve simply bypasses the heat exchanger. The valves sense fluid temperature 100% of the time while the system is on,or off; this valve needs no power source,and functions on a thermal expansion basis. Thermal actuators are at the heart of this valve,and understanding how thermal actuators function is key to understanding how these valves function.
When selecting the proper valve you must consider the following criteria:
- Needed flow rate;determines what size valve you need
- Activation temperature; at what point will the valve begin to change ports
- Fully diverted temperature; at what point betweenwill the valve fully changed ports
- What type of ports you need for system installation; NPT,BSP,AN,SAE,METRIC
Valve Sizes and Styles:
All three port valves function the same way,what sets them apartis their size, body style,and port type which is determined by the customer's application.
Three Port Valve Examples
|Body Style A||Features||Body Style B||Features|
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|Drawing: Valve Sizes & Options||Drawing: Valve Size & Options|
You can test the EGR using a scanner2004-05-14 11:51:39 by OBD2
The scanner should be hooked-up and on data monitor screen to see all the values of each sensors and actuators. Engine should be at closed loop. Rev. the engine to 2500 RPM and feel the pintle valve or bottom EGR diaphragm's movement, at the same time look at the scanner reading if the computer turns an EGR ON/OFF command. If your friend said the EGR is working when he applied vacuum, did he use a Vac.pump? or did he just rev. the engine up to 2500 RPM?. I suggest to check the "VSV"- vacuum switching valve for proper voltage. It could be stuck to closed position and not allowing vacuum air to operate the EGR valve or no ground from computer is being delivered on demand
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