Pilot-type dynamic differential pressure balance valve

Abstract

The invention discloses a pilot-type dynamic differential pressure balance valve. The pilot-type dynamic differential pressure balance valve comprises a main valve assembly and a pilot valve assembly;the main valve assembly includes a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve elastic part and a main valve core; a main valve inlet isconnected with a rear end of a load system; a main valve port is arranged between a main valve outlet and the main valve inlet; the main valve piston divides an inner cavity of the main valve pistoncylinder into a main valve upper cavity and a main valve lower cavity; the main valve lower cavity communicates with the main valve outlet; the pilot valve assembly includes a pilot valve body, a pilot valve cover, a pilot piston, a shut-off hood, a shut-off check ring, a pilot elastic part and an adjusting shaft; the pilot piston divides an inner cavity of the pilot valve body into a pilot valveupper cavity and a pilot valve lower cavity; the pilot valve upper cavity hermetically communicates with the main valve inlet; and the pilot valve lower cavity hermetically communicates with a front end of the load system. The pilot-type dynamic differential pressure balance valve of the invention has a small pilot valve size, is easy to install and disassemble, improves control accuracy, and makes system differential pressure more stable.

Description

technical field [0001] The invention relates to a dynamic differential pressure balancing valve, in particular to a pilot-operated dynamic differential pressure balancing valve. Background technique [0002] In central heating and cooling systems, dynamic differential pressure balancing valves are usually installed to maintain a constant pressure differential between two points in the water system piping. The dynamic pressure difference balance valve generally adopts the direct-acting diaphragm adjustment form, and the pressure before and after the controlled system is transmitted to both sides of the pressure-sensitive diaphragm, and when the pressure difference between the front and rear of the controlled system changes, it will be fed back to the pressure-sensitive diaphragm And directly drive the valve core to move, thereby changing the valve opening. When the pressure difference increases, the spool closes; on the contrary, when the pressure difference decreases, the s...

AI Technical Summary

Problems solved by technology

The existing dynamic differential pressure balance valves are generally large in size, especially the diaphragm part takes up a large space, which makes installation, maintenance and replacement inconvenient; and the control of differential pressure is not accurate enough, and the performance of differential pressure control is not ideal.

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