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Experience shows that oil stiction forces negatively impact valve life in reciprocating compressors by delaying valve opening andcausing an increase in valve plate impact velocity. Although some research has been performed in the past to investigate and model oil stiction, a validated model for predicting stiction-induced forces is not available in the current literature. The research presented in this paper extends the work shown in previous publications by (1) developing a valve dynamics model with stiction forces included, (2) validating the model using data from shock tube testing of a valve, and (3) showing that stiction forces can be reduced by bead blasting on valve plate contact surfaces. The first section of the paper describes the development of a one-dimensional valve model that includes aerodynamic (pressure and drag), spring, and stiction forces on a valve plate. The stiction force component of the model uses flat plate stiction force equations developed in previous work and extends them to a valve environment by including the effects of valve geometry and static pressure differential on the oil film. This simulation predicts that the pressure differential across the valve will expel the oil film from between the contact surfaces prior to rupture of the oil film. Inclusion of this “blow out” effect is a new contribution to stiction modeling in valves and significantly reduces the predicted length of the stiction event.
Your Price $195.00
List Price $195.00