Double-damping high-pressure back pressure valve without diaphragm

The invention relates to a double-damping high-pressure back pressure valve without a diaphragm. The double-damping high-pressure back pressure valve comprises a main valve body, an auxiliary valve body, a main valve core, an auxiliary valve core, a pressure reducing cylinder, a valve core pressing plate, an auxiliary spring, a main spring and a main spring gland; the auxiliary valve body is arranged in the main valve body, the lower end of the pressure reducing cylinder is connected to the main valve body, the upper end is connected to the main spring gland, and the main valve core is arranged in the pressure reducing cylinder; and the lower end of the main valve core and the auxiliary valve body are sealed or separated to open and close a back pressure valve, the upper end of the main valve core is connected with the auxiliary valve core, the upper end of the auxiliary valve core is connected with the valve core pressing plate, the main spring is arranged between the valve core pressing plate and the main spring gland, and the auxiliary spring is arranged between the auxiliary valve core and the main valve core. Compared with the prior art, the double-damping high-pressure back pressure valve without the diaphragm is provided with the auxiliary spring providing damping in addition to the main spring providing spring back for the valve core. The auxiliary spring is used for absorbing and releasing part of the energy, so that the speed of opening and closing of the valve core can be eased, and the pulse generated by a pump in the valve body is smoother and the performance of the back pressure valve is improved significantly.