Recommendations for self-acting pressure regulators and temperature control valves

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Hello, esteemed colleagues. I need a pressure regulator for compressed gas at 20 bar, with both pre-valve and post-valve pressure control functions. I am considering using a self-acting pressure regulator; I’ve used a certain brand before, and its adjustment accuracy is acceptable, but the leakage rate of that valve is quite high. When the supply pressure is low, the pressure after the valve becomes excessively high, which requires the use of an automatic shut-off valve in front of it. Additionally, its appearance is a bit unsatisfactory. Could you recommend some decent self-acting valves, both domestic and international? Pursuing cost-effectiveness – things that are too expensive are unaffordable: lol. I’m also hoping for recommendations on self-actuating temperature control valves used to regulate the heating of steam feed water, with the water temperature generally kept around 50°C.