The throttle valve is a valve that controls the flow of fluid by changing the throttle section or throttle length. The throttle valve and the one-way throttle valve are simple flow control valves. In the hydraulic system, the throttle valve and the relief valve can be combined to form three throttle speed control systems, namely the oil inlet throttle speed control system, Throttle speed governing system for return oil passage and bypass throttle speed governing system. Hydrotech produces high-quality hydraulic throttle valves and other hydraulic system accessories.
Hydraulic Throttle Valve
The hydraulic throttle valve is a flow control valve with a simple structure and a very wide range of applications. It is often combined with a relief valve to form a variety of throttle speed regulating circuits or systems for quantitative pump oil supply. According to the different operation methods, the throttle valve can be divided into manual adjustment type ordinary throttle valve, stroke stop or cam and other mechanical moving parts operated stroke throttle valve, etc.; hydraulic throttle valve can also be combined with one-way valve, etc. Compound valves such as the one-way throttle valve and the one-way stroke throttle valve.
2.hydraulic throttle valve structure
The hydraulic throttle valve has simple structure, small size, convenient use and low cost. The valve port of this hydraulic throttle valve has a large adjustment range, and the flow rate is linear with the pressure difference before and after the valve port. It has a small stable flow rate. However, the flow channel has a certain length and the flow rate is easily affected by temperature and load. Therefore, Hydrotech Tell you that this hydraulic throttle valve is only suitable for hydraulic systems with little temperature and load changes or low speed stability requirements.
3.Use of throttle
Experiments show that when the hydraulic throttle valve is working with a small opening area, although the pressure difference and oil viscosity remain unchanged before and after the valve, the flow through the valve will periodically pulsate from time to time. time. Phenomenon, with the gradual decrease of the opening degree, the flow pulsation changes intensified, and even intermittent cut-off occurs, so that the throttle valve completely loses its working ability. The above phenomenon is called the clogging phenomenon of the throttle valve.The clogging phenomenon of the throttle valve makes the flow of the hydraulic throttle valve unstable when working at a small flow rate, which leads to the crawling phenomenon of the actuator. Therefore, the hydraulic throttle valve should have a minimum flow limit that can work normally. This limit is called the minimum stable flow rate of the throttle valve, and it is used in the system to limit the minimum stable speed of the actuator.
4.Other notes for hydraulic throttle
(1) The hydraulic throttle valve is a valve that controls the fluid flow by changing the throttle section or throttle length. Connect the throttle valve and the one-way valve in parallel to form a one-way throttle valve. The throttle valve and the one-way throttle valve are simple flow control valves. In the hydraulic system of a fixed pump, the throttle valve and the overflow valve can be combined to form three throttle speed control systems, that is, the throttle speed control system of the oil inlet. System, oil return line throttling speed control system and bypass throttling speed control system.
(2) The hydraulic throttle valve has no flow negative feedback function and cannot compensate for the unstable speed caused by load changes. Generally, it is only used for occasions where the load changes little or the speed stability is not high. A hydraulic pressure control valve. In hydraulic equipment, it mainly plays the role of constant pressure overflow and safety protection.
(3) The performance requirements of the hydraulic throttle valve are: 1. Large flow adjustment range, smooth flow pressure difference; small internal leakage, if there is an external leakage port, the external leakage should also be small; the adjustment torque is small, the action Sensitive.