According to reports, General Motors released a series of vehicle recall notices on April 15th, recalling nearly 1.04 million pickup trucks, including Chevrolet West Verado and GMC Sierra 1500, due to seat belt failure. GM said it would recall 895,232 2014-2015 Chevrolet West Verado and GMC Sierra 1500 pickup trucks in the US market and will stop selling 3,000 2014-2015 pickup trucks at dealerships.
According to the general explanation, the warranty data shows that the driver can repeatedly bend the flexible steel cord that connects the seat belt and the body when sitting in the seat. After a long time of use, it may fall off, causing the seat belt to slack and increase the accident. The risk of casualties among passengers, so the recall of the relevant fault involved vehicles.
GM said that there are no accident-related accidents and casualties, and the cost of this large-scale recall is “not expected to be high and will be covered by the warranty reserve in the normal rangeâ€.
Wafer type check valves have Short face-to-face dimensions and low weight, and provide an economical, space-saving solution when compared to traditional swing check valves.
Dual-plate Wafer Check Valve
Dual-plate check valves are are bonnetless and mounted between pipe flanges (wafer style). In this case, the valve includes two spring loaded half-moon shaped discs that rotate about their shaft. The actual designs of these valves vary between design models and manufacturers. Most have multiple flat seats. The dual-plate Check Valve disc has short rotational disc travel and responds quickly to flow stoppage or reversal, thus the potential for moderate water hammer does exist. It is somewhat better than the Swing Check Valve at minimizing potential water hammer, but with a much higher pressure drop.
Depending on the design, maintenance effort ranges from relatively simple to difficult. All dual-plate check valves must be removed from the line to perform maintenance due to the bonnetless design. The dual-plate check valve also results in a higher pressure drop when compared to a Tilting Disc Check Valve of the same size.
Single-plate wafer check valve
Single-plate wafer check valves(lift type) prevent reverse flow with disc movement that is parallel with the flow. With this design, the disc is always in the flow path. Discs are spring-loaded to assist in seating.
And another thin type single-plate wafer check valves are swing type, that performs the same with swing check valve with much less cost. The disadvantage of this single-plate wafer check valves is, the inside diameters of the valves can only meet 60-80% of Norminal Pipe Size(NPS), which limits the flow coefficient.
Wafer Check Valve
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