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This is an internal valve which is shut off by water pressure, and it is opened only by connecting a fitting or appliance; thus, disconnecting a hose fitted with this adaptor will automatically stop the flow of water. This eases connecting and changing appliances without the need to shut off the water first.
When a second stage upstream valve is used a relief valve will be included by the manufacturer on the first stage regulator to protect the hose. [3]: 9 If a shut-off valve is fitted between the first and second stages, as is found on scuba bailout systems used for commercial diving and in some technical diving configurations, the demand valve ...
Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts off, compared to multiple 360° turns for other manual valves; Butterfly valve, for on–off flow control in large diameter pipes
When a second stage upstream tilt valve is used a relief valve should be included by the manufacturer on the first stage regulator to protect the intermediate hose. [4]: 9 If a shut-off valve is fitted between the first and second stages, as is found on scuba bailout systems used for commercial diving and in some technical diving configurations ...
A breakaway valve is also fitted to the hose so that the nozzle and hose will detach and fuel flow will stop if a motorist drives off with the nozzle still in the filler. Nozzles are usually color-coded to indicate which grade of fuel they dispense, but the color-coding differs between countries and even retailers.
Valves and their types and identifications (e.g. isolation, shutoff, relief and safety valves, valve interlocks) Control inputs and outputs (sensors and final elements, interlocks) Miscellaneous - vents, drains, flanges, special fittings, sampling lines, reducers and swages; Interfaces for class changes; Computer control system