4 Main Parts Of EGR Valve

With knowledge on each EGR valve part, you can check them up and see what you can do before submitting them for fixes at car repair shops.

Exhaust gas recirculation or EGR valve reduces combustion temperature by sending some amount of the gas back to the cylinders of the exhaust engine. This is an integral process that contributes to cleaner air and clearer road visibility. About 5% to 15% of the gas is sent back to the intake in typical car engines.

egr valve parts

Vehicles use exhaust gas recirculation valves, either a vacuum-operated or a pressure-operated one. Regardless of the type used, the common parts are included in the next section of this article.

1. Primary Valve Diaphragm

This part pulls the valve open when vacuum is applied to the valve. This process allows the exhaust to pass through the intake manifold from the exhaust manifold.

2. Secondary Diaphragm

This part serves as a modulating medium. It regulates the actions of the primary diaphragm. This part prevents the valve from opening until backpressure level is sufficient.

3. Ported Vacuum Switch (PVS)

Also known as thermal vacuum valve (TVS), this part controls the passage of the vacuum that in turn makes the valve work. It remains closed until the engine’s coolant reach adequate levels. This part is screwed either into the intake manifold or thermostat housing to facilitate contact to the engine’s coolant. The PVS also contains a wax plug that thrusts the sliding plungers to block vacuum ports of the switch. This action is triggered by the expansion of the wax plug as the engine heats up.

4. Vacuum Control Solenoid

This is another device that regulates the vacuum coming in and out of the EGR valve. This device is composed of magnetic coils connected to a plunger that blocks and uncovers the vacuum ports depending on the voltage supplied to the coils. The voltage is modulated by timers, relays or engine computers depending on the car model in use.

Adequate knowledge on the different parts of an exhaust gas recirculation valve will help you grasp on the working purpose of each one and how they contribute to the proper functioning of the valve as a whole unit. Familiarizing yourself with each part will help you attain better understanding of the principles that make valves work. With working knowledge on each part, embrace some advantages like:

1. Basic troubleshooting ideas on each part.

By knowing how the parts are connected to each other and how the parts work, lay out simple solutions to simple problems.

2. Damage prevention through reduced heat rejection.

Having knowledge of the exhaust gas recirculation valve’s various parts shall give adequate understanding on the significance of diminished temperatures.

3. Proper caring and maintenance of each part.

The key to sufficient valve care and maintenance largely depends on the user’s familiarity with its various parts.

4. Significant cost reduction in terms of repair costs.

If you are gearing on passing emissions tests to sport your car in every major road, you are likely to spend quite some fortune to make your valve and car pass the standards. With knowledge on each EGR valve part, you can check them up and see what you can do before submitting them for fixes at car repair shops. There are some tips for maintenance a EGR valve