It appears to be a precursor to PL ratings that are now the new requirements which encompass hydraulic and pneumatic valves.
12.
As the operation of pneumatic valves over motorised valves has many cost and reliability advantages, pneumatic actuation is still an industry standard.
13.
Traditional train braking systems use pneumatic valves to control and generate brake applications on the cars along the length of the train.
14.
A later development was the tubular-pneumatic action, which uses changes of pressure within lead tubing to operate pneumatic valves throughout the instrument.
15.
Various techniques have been used to offset the effect of stiffer springs, such as dual-spring and progressive-sprung valves, roller-tipped tappets, and pneumatic valve springs.
16.
Since the 1990s, all Formula One engine manufacturers used pneumatic valve springs with the pressurised air allowing engines to reach speeds of over 20, 000 rpm.
17.
On 100 kPa input, you could lift a small car ( upwards of 1, 000 lbs ) easily, and this is only a basic, small pneumatic valve.
18.
Renamed to John Guest Ltd in the early 1970s, Guest castings started producing more complex die-cast items and machining for the UK s major pneumatic valve manufacturers.
19.
The rifle uses the Pneumatic Valve and Rod system, which was created as a more reliable design than the traditional direct gas impingement system of the AR-15 family.
20.
The EF15B was to appear in two forms, the standard engine and the " D . P . " engine which featured pneumatic valve springs for the first time.
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