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A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.
The Schrader valve consists of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A small rubber seal located on the core keeps the fluid from escaping through the threads. Using the appropriate tools, a faulty valve core can be immediately extracted from the valve stem and replaced with a ...
In the case of the downstream check valve passing, the differential pressure relief valve prevents the possibility of the chamber pressure from exceeding the supply pressure. It is theoretically possible that, when both valves are faulty, backflow could occur, should the reverse flow rate exceed the capacity of the relief valve.
The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...
KTM is an Austrian motorcycle, bicycle and motorsports brand which is co-owned by Indian manufacturer Bajaj Auto and Austrian manufacturer Pierer Mobility AG. It traces its foundation to 1934 as Kronreif & Trunkenpolz Mattighofen.
Knock-down kit assembly plants are less expensive to establish and maintain because they do not need modern robotic equipment, and the workforce may be less costly than in the country of origin. The plants may also be effective for low-volume production. The CKD concept allows firms in developing markets to gain expertise in a particular industry.
Stafford completed his first 10 passes and helped the Rams race out to a 10-0 lead. It was an advantage the Rams would never relinquish. The Rams dominated the first half and built a 24-3 halftime ...
Indeed, many gas turbine engine seals leak by design. [4] Labyrinth seals are also found on pistons, which use them to store oil and seal against high pressure during compression and power strokes, as well as on non-rotating shafts. In these applications, it is the long and difficult path and the formation of controlled fluid vortices plus some ...