Inquiry (采购产品): vibration testing Test Request Objective: Evaluate the robustness of four suction valve variants to the impact load caused by full stroke opening. General Procedure: Subject several suction valve assemblies to 10 million acceleration pulses to simulate 10 million suction valve openings. Introduction: The suction valve is a spring loaded poppet valve. The spring tends to close the valve. In service, hydraulic pressure overcomes this spring force to open the valve. The opening travel is limited by a part that is captured by a circlip. Hence much of the kinetic energy of the valve opening motion is absorbed by the circlip when the valve opens fully. Some failures of this circlip have been observed. A new clip design has been proposed. Rapid validation via durability test is required. The maximum impact velocity is not known exactly. Old and new designs shall therefore be subjected to the same loads. All valves will have to be periodically inspected. The suction valve assemblies under test will be clamped in a fixture in a manner similar to service clamping. The fixture will be accelerated at a level and duration to produce a specified opening impact velocity. Specifics: The maximum velocity of the suction valve during opening impact has been estimated to be 1 m/s. This type of impact can be produced by accelerating the valve assembly with a square wave of 2000 m/s^2 and 2.5 ms duration. This is the preferred wave profile. However, if 2000 m/s^2 is not achievable, we will consider a lower amplitude profile. We might be able to reduce the preload of the suction valve springs, thus allowing for the same impact speed with only 1000 m/s^2 for 2 ms. The exact acceleration profile, including compensation, should be captured digitally so that we can check it to ensure proper function. Attached is a drawing of a fixture that has been built for this test. It weighs approximately 2.7 kg with all suction valves and fixture bolts. Via a bore scope, it should be possible to inspect the parts for breakage without any disassembly. One of our engineers should be present to monitor the test. **** Hidden Message ***** Peter Barthel 121 Research Drive Columbia, SC 29203 USA Company: Continental Corporation Title: team leader test Phone: 803 227 5736 E-mail: peter.barthel@continental-corporation.com **** Hidden Message ***** peter.barthel@continental-corporation.com
