Valve seats can be categorized into several types based on their design and application. Common types include integral seats, which are part of the valve body, and replaceable seats, which can be individually replaced when worn. Other categories include screwed-in seats for easy replacement and soft seats made from materials like elastomers for better sealing at lower pressures. Additionally, seats can be classified by the type of valve, such as gate, globe, or ball valves, each requiring specific seat designs for optimal performance.
Seat leakage is defined as leakage that is internal to a valve-between the inlet and outlet sides of the valve-when the valve is in its closed position. It is not limited to leakage across the valve seat, but also encompasses all leakage across the valve trim when the valve is in the closed position. Leakage across internal trim seals, such as piston rings, and across trim-to-body seals, such as gaskets, can be counted as seat leakage. It is important to note that, while leakage through valve stem packing is of growing concern in the industry, governing industry standards address this type of leakage separately and do not consider it to be a form of seat leakage.
It is the "Advertised duration", used by the factory. It is the Valve timing from when the valve is .006inches off the valve seat to .006" off the valve seat.
The valve face
yes
Better heat distribution. The exhaust valve sees a lot more heat.
the valve transfers the heat to the valve seat (when the valve is closed)
To perform a faucet valve seat replacement, you will need to turn off the water supply, remove the faucet handle and trim, unscrew the valve seat using a seat wrench, clean the area, and install the new valve seat by screwing it in place. Finally, reassemble the faucet and turn the water supply back on to test for leaks.
The optimum way is to remove (unscrew with a seat wrench) the seat and replace it. A seat cutter tool may be used to refinish the seat in place.
The Globe valves are generally used to control the flow rate and ball valve used for open /close purpose only.A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it.
Valve taps often occur as a result of a misalignment in the fitting they are in, or a worn out valve seat. In many cases, a new valve spring and cam adjustment will fix the problem, but if it the result of a worn out valve seat, it will have to be machined.
I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.
Never. Throttling will erode the valve seat and then the valve will never shut off completely.