A pressure regulator (10) including a body (12) having an internal chamber (110) and a thermal shield (124) made of a material having a lower thermal conductivity than a material of the body (12) for reducing heat transfer between the body (12) and the fluid flowing into the internal chamber (110). By reducing heat transfer between the fluid and the body (12), the temperature of the components of the pressure regulator (10) is increased to reduce failure of the components and the density of the fluid is increased to improve the flow capacity of the pressure regulator (10).