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The wafer style butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, precision machined, and a flat valve face on the upstream and downstream sides of the valve.the drawback ...
Pneumatically-actuated globe valves and diaphragm valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used. Control valves can also work with hydraulic actuators (also known as hydraulic pilots). These types of valves are also known as automatic ...
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Swirl flap principle in a four-valve engine. A swirl flap is a small butterfly valve fitted to four-stroke internal combustion engines with at least two intake valves.It is installed inside or just before one of a cylinder's two intake ports, allowing to throttle its intake port's air flow, causing a swirl in the other intake port not fitted with a swirl flap.
A ball valve is a flow control device which uses a hollow, perforated, and pivoting ball to control fluid flowing through it. It is open when the hole through the middle of the ball is in line with the flow inlet and closed when it is pivoted 90 degrees by the valve handle, blocking the flow. [1]
side-valve W32-7, W33-7, W34-8, W35-7 499 cc 1932 1935 overhead valve W33-8, W34-9, W35-8 Blue Star: 499 cc 1933 1935 overhead valve W33-9, W34-10, W35-9 499 cc 1933 1935 overhead valve B20 Tourer 249 cc 1937 1938 side-valve B21 Sports 249 cc 1937 1939 overhead valve B22 Empire Star 249 cc 1937 1938 overhead valve B23 Tourer 348 cc 1937 1939
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