Balance valve for pump truck and secondary overflow valve response differential pressure control method thereof

Abstract

A balance valve for a pump truck and a secondary overflow valve response differential pressure control method thereof are structurally mainly composed of an orifice plug 1, a valve body 3, a control piston 4, a main valve core 5, a one-way valve core 6, a small spring 7, a small spring seat 8, a main spring 9, a main spring seat 10, a damping plug 11, an overflow valve core 14, an overflow valve spring 15, an overflow valve spring seat 16, a locking nut 17, an adjusting screw 18, an adjusting seat 19 and the like. The pressure difference control principle of opening and closing of a secondary overflow valve is that as long as the overflow valve core 14 is flushed to be open and oil liquid flows, the force which is balanced with the spring force of the overflow valve spring 15 is changed to be the force which is generated by the fact that the pressure of an A cavity multiplies the area of an overflow hole of the valve body 3 and then pluses the force which is generated by the fact that the pressure value established by a damping small hole in the damping plug 11 multiplies the cross section area of a guide support cylinder of the overflow valve core 14, and the force which is generated in the ring shape area of the area of the overflow small hole in the valve body 3 is deducted. The pressure drop generated by the damping hole forms the pressure difference of corresponding closing and opening of the overflow valve core 14.

Description

1. Technical field: [0001] The invention relates to a pressure difference control method for a balance valve for a pump truck and a secondary relief valve thereof. This balance valve is especially suitable for concrete pump trucks with high precision, high pressure and high sealing life and reliability requirements, and also suitable for other various heavy machinery equipment. 2. Background technology: [0002] It has been decades since the first self-designed series of balancing valves for heavy machinery and equipment products in my country have been designed into a unified design. With the continuous development of the main engine, the requirements for its various performances have been continuously improved. The original balance valve products can no longer adapt, and their main shortcomings are: poor flow capacity of the flow channel, large pressure loss; high control pressure, rapid temperature rise of the system; poor sealing reliability, short life; lack of flow seg...

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Problems solved by technology

These are not available in domestic balance valves at present, which has led to the long-term dependence of such products on imported accessories and hindered the development of my country's main engine equipment.

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