Self-operated balance valve

Abstract

The invention discloses a self-operated balance valve. The self-operated balance valve comprises a valve body, a gasket, a position-limiting stud, a pressing cap, a valve, a valve seat, a diaphragm, a valve deck, a nut, a pressure-regulating shaft, a spring, a spring seat, a screw, a baffle and a valve rod, wherein the valve is fixedly connected to the valve rod; the big end of the valve rod is inserted into a center hole at the cavity end of the valve body to charge the valve seat into the valve body; a water outlet is flush with a threaded hole of a water outlet pipe of the valve body, then the baffle is mounted, and the assembly of the spring seat and the diaphragm is screwed into the threaded head of the valve rod; the pressure-regulating shaft is screwed into the threaded hole at the cover end from the inner side of the valve deck; the columnar end of the pressure-regulating shaft is sleeved by the spring; the other end of the spring is fastened to the spring seat; the valve deck is buckled into a step of the valve body; the valve deck is screwed with the valve body through a screw; the pressure-regulating shaft is locked by the nut; the position-limiting stud is screwed into the center hole of the valve body; the gasket is placed in, and the pressing cap is screwed up tightly. The elf-operated balance valve, disclosed by the invention, is connected in series with a branch, can be adjusted automatically around the setting value to ensure the relative stability between flow and pressure at the work end.

Description

technical field [0001] The invention relates to a self-operated balance valve. Background technique [0002] In some industries, due to working conditions, the medium has a large pressure difference or flow difference in various parts of the pipeline or container. In order to reduce the difference, it is necessary to set up components with balancing functions to adjust The relative balance of the pressure of each branch, or the balance of the flow through the method of shunting. The function mechanism of the self-operated balance valve is to control the passing flow within a certain range of working pressure difference. For example, when the pressure difference between the front and rear of the valve increases, the valve core automatically closes down to keep the flow rate from increasing; on the contrary, when the pressure difference decreases, the valve core opens up to keep the flow rate basically constant; In this range, the balance valve itself cannot provide addition...

AI Technical Summary

Problems solved by technology

[0003] The upper and lower chambers of the existing self-operated balance valve are wet chambers, and the buffer pretension spring is set in the medium, which will cause fouling on the surface of the spring for many years, resulting in reduced sensitivity or functional failure

Furthermore, the spring preload cannot be adjusted, and the pressure difference established through the pressure guiding tube fluctuates relatively frequently and has poor stability.

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