Thermostatic temperature control valves are a rugged, reliable and repeatable means of controlling your vital fluid temperatures. But the ability of your temperature control valve to maintain a constant temperature can fade over time. Prolonged operation at extreme temperature, pressure and flow can reduce the effectiveness of your TCV, as can exposure to foreign chemicals and particulate matter. Film and scale can develop on internal mechanisms, components can wear, corrode or fatigue and elastomeric O-rings can harden or swell. Degradation of components can eventually cause a degradation in valve performance. And as temperatures begin to stray from your desired set point, your engine or turbine performance begins to suffer.