(1) Structure principle 1 The MK type one-way throttle valve Figure 27 is the MK type one-way throttle valve structure schematic diagram. The valve is a one-way throttle valve connected by a tubular type, and its throttle port adopts an axial triangular groove structure. Rotate the adjustment nut 3, can change the throttle mouth flow area size, in order to adjust the flow. Positive flow when the throttle valve action, the reverse flow when the one-way valve action, at this time because there are some oil liquid can flow in the annular gap, you can clear the throttle mouth sediment.

In the valve body 2 left side has the scale groove, adjusts the nut 3 to have the scale, uses the marking to adjust the flow the size. 2 F-type precision throttle valve Figure 28 is the F-type precision throttle valve structure schematic diagram. The valve is mainly composed of valve body 1, adjusting parts 2 and throttle sleeve 3. The throttling of the flow from A to B is achieved at throttle Port 4. Turning Throttle Bar 5, Adjustable throttle section.

Because the orifice is made of thin wall hole, throttling is not easy to be affected by temperature.

(2) Application Throttle valve and one-way throttle valve is a simple flow control valve, they are in the quantitative pump hydraulic system of the main role is with the overflow valve, composed of three kinds of throttle speed regulation system: that is, the injection throttle speed regulation system, oil back throttle speed regulation system and bypass throttle speed system. Two one-way throttle valves are available for the system that performs components requiring a round-trip throttle speed adjustment. Throttle valve is also used in the volume throttle speed control circuit. This valve has no pressure and temperature compensation device, can not automatically compensate the load and oil viscosity changes caused by the speed of instability, but its simple structure, manufacturing and maintenance convenience. So it is widely used in general hydraulic system with little load change or low speed stability requirement.