A Medical Gas Regulator is a control device that maintains a defined pressure of a system by cutting off the flow of a gas or liquid when it reaches a set pressure. Pressure regulators come in several types and configurations and they provide control in a variety of applications in oil and gas processing. Medical Gas Regulator fall under two main categories; direct operated or pilot-operated. The essential components that make up a direct-operated regulator are a plug and seat, a diaphragm, and a spring.