German LANNY valves LANNY models LANNY prices

LANNY valves, also known as speed synchronization valves, are a general term for flow divider valves, flow collector valves, one-way flow divider valves, one-way flow collector valves, and proportional flow divider valves within hydraulic valves. Synchronization valves are mainly applied in hydraulic systems with synchronous control of dual-cylinder and multi-cylinder configurations. There are many methods to achieve synchronous motion, but hydraulic systems using flow divider-collector valves (synchronization valves) offer advantages such as simple structure, low cost, ease of manufacturing, and high reliability; therefore, synchronization valves are widely used in hydraulic systems. The synchronization provided by flow divider-collector valves is speed synchronization. When two cylinders or multiple cylinders bear different loads respectively, the flow divider-collector valve can still ensure their synchronous motion.

LANNY valve function

The function of a flow divider valve is to supply the same flow rate (equal flow division) from the same oil source to two or more actuators in a hydraulic system, or to supply flow to two actuators at a certain ratio (proportional flow division), thereby maintaining synchronous speed or a fixed ratio between the two actuators. [1] The function of a flow collector valve is to collect equal return flow rates or proportional return flow rates from two actuators, thereby achieving speed synchronization or a fixed ratio between them. A flow divider-collector valve combines the functions of both a flow divider valve and a flow collector valve.

LANNY valve classification

Classified by adjustment method: fixed flow divider-collector valves, self-adjusting flow divider-collector valves, adjustable flow divider-collector valves, and combined self-adjusting and adjustable flow divider-collector valves. The above series of hydraulic valves can be designed as low-flow flow divider-collector valves. Among these, fixed-structure synchronization valves can be further divided into two structures: reversing piston type and hook-head type. This series of hydraulic valves can also be classified by flow distribution method into: equal-flow flow divider valves and proportional-flow flow divider valves, with the commonly adopted ratio being 2:1. Low-flow synchronization valves can also be designed according to the required ratio.

Difference between LANNY valve flow collector valves and flow divider valves

1) The flow collector valve is installed on the return oil lines of two actuators, combining the return oil flow from the two load paths; 2) The two flow sensors of the flow divider valve share the inlet pressure; the greater the flow through the flow sensor, the lower its outlet pressure. The two flow sensors of the flow collector valve share the outlet; the greater the flow through the flow sensor, the higher its inlet pressure. Therefore, the pressure feedback direction of the flow collector valve is exactly opposite to that of the flow divider valve; 3) The flow collector valve can only ensure synchronization during the return stroke of the actuators.

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