A pressure control valve assembly including a valve body with a valving cavity, a metal insert, a member and ball, a plastic internal ball guide, and a plug. The resin composition is excellent in storage stability, and gives a cured product excellent in flame retardancy and heat resistance. The aluminum gallium nitride layer has a mole fraction of aluminum that is sufficient to bring the conduction bands of the silicon carbide substrate and the aluminum gallium nitride into close proximity, but less than a mole fraction of aluminum that would render the aluminum gallium nitride layer resistive. The related performance measuring system is preferably a timing system that ensures quick, easy, and accurate collection of athletic event timing related data without the need for the athlete to wear any special detection devices or the like. According to the present invention, a lithium secondary battery can be made readily and efficiently.