How does a bypass valve work on a thermostat?
How does a bypass valve work on a thermostat?
But a completely separate spring loaded bypass valve (B) independently controls the bypass. The way this works is that when the thermostat is closed, it arrests flow, which creates a local area of high static pressure. This pressure opens the bypass valve, allowing coolant to recirculate to the pump (P) and back to the engine (E).
What was the bypass on a Cadillac thermostat?
The bypass in this early Cadillac comprised a small tube leading from the carburetor water jacket to the pump inlet. This was sufficient to provide some circulation when the thermostat was closed, the clear intent being to encourage fuel vaporization. However, the open bypass was not designed to limit flow when the thermostat was open.
What happens when you close the thermostat on a radiator?
In this discussion, we will discuss what happens when the thermostat is closed, blocking the path to the radiator. When the thermostat blocks the path to the radiator, the water pump continues to work. If the radiator inlet was the only path for water to follow, flow would stagnate. This would have several undesirable effects.
What happens when the thermostat is open in a car?
When the thermostat is open, static pressure throughout the system will be fairly uniform, so the bypass valve closes. Here are a few photos of the bypass valve: Eventually, this system evolved into the open bypass systems used in most American cars of the 1960’s. Open bypass will be discussed in the main chapter on bypass systems. Chrysler 1934
But a completely separate spring loaded bypass valve (B) independently controls the bypass. The way this works is that when the thermostat is closed, it arrests flow, which creates a local area of high static pressure. This pressure opens the bypass valve, allowing coolant to recirculate to the pump (P) and back to the engine (E).
Where does the hot water go after bypass?
With the bypass in place about 20% of the hot water coming from the engine gets pulled into the water pump and pumped right back into the engine. Never goes through the radiator. Click to expand…
Is it better to block the water bypass hose?
Keeps water from cavitating in the pump while the thermostat is closed. Take out the thermostat and you can block the hose. Leave it all as stock and you’re better off. There’s no real advantage to removing it is there?
The bypass in this early Cadillac comprised a small tube leading from the carburetor water jacket to the pump inlet. This was sufficient to provide some circulation when the thermostat was closed, the clear intent being to encourage fuel vaporization. However, the open bypass was not designed to limit flow when the thermostat was open.
