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

Abstract

The invention discloses a balance valve for a pump truck and a response differential pressure control method of a secondary overflow valve of the balance valve for the pump truck. The balance valve for the pump truck is structurally and 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 rod 18, an adjusting seat 19 and other components. The opening and closing pressure difference control principle of the secondary overflow valve is that as long as the overflow valve core 14 is flushed open and oil flows, the force balanced with the spring force of the overflow valve spring 15 turns into the force which is obtained by adding the force I generated by multiplying pressure of a cavity A by the area of a small overflow hole in the valve body 3, and the force II generated by multiplying a pressure value obtained from a small damping hole in the damping plug 11 by the area obtained by deducting a circular area of the area of the small overflow hole in the valve body 3 from the sectional area of a guiding support column of the overflow valve core 14; and the pressure drop generated by the small damping hole forms the differential pressure of the overflow valve core 14 at the closing time and the opening time.

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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