Initial Opening of a Compressor Valve

Optimization of Compressor and Valve Design - An Initial Study Using A Direct Search Technique

This paper describes the "Complex" method of optimisation applied to a simulation model of a compressor. Criteria which may be optimised and constraints to be imposed on design parameters are discussed. The numerical results obtained during a search to optimise valve design for a particular compressor are presented.

Premature pulmonary valve opening.

Premature opening of the pulmonary valve (opening independent of atrial or ventricular systole) was originally described in a case of sinus of Valsalva rupture into the right atrium. Since that time we have observed five additional cases in which the pulmonary valve opened prematurely. Entities encountered included: 1) constrictive pericarditis; 2) Loeffler's endocarditis; 3) Ebstein's anomaly ...

Finite Element Analysis of Compressor Valve Dynamics

Bending Fatigue Failures of Compressor Valve Reeds

Bending fatigue failures OI cantilever type suction valve reeds occurred under operating conditions in a semi-hermetic refrigerant compressor during field trials. The finite element method (FEM) was applied to predict both the static and dynamic displacements and the resultant stresses of the reeds. The dynamic stresses in the location of the fracture exceeded the fatigue limit of the reed stee...

The Dynamics Of Reciprocating Compressor Valve Springs

The valves in reciprocating compressors use springs to control the timing of the valve closing. These springs are subjected to dynamic loading by the motion of the valve element. The element motion is periodic, but includes rapid acceleration and deceleration. It can therefore excite a wide range of frequencies in the spring. The resulting spring surge creates high stresses and is a major contr...