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Self-operated nitrogen seal valve device control valve, nitrogen supply valve, and nitrogen relief valve. Taking the pressure after the valve as the power source, the pressure after the valve is introduced to the diaphragm of the pilot to control the position of the pilot valve spool. By changing the medium pressure and flow passing through the pilot valve spool, the pressure at the back end of the valve is kept constant. The pressure setting of the imported self-operated nitrogen seal valve is realized on the spring on the pilot. Tightening the compressed spring will increase the pressure after the valve, and vice versa. The operation is simple, so it is convenient and handy. It has