German CFM Schiller valves, CFM Schiller models, CFM Schiller prices

CFM Schiller 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 among hydraulic valves. Synchronization valves are mainly applied in hydraulic systems with synchronous control of dual-cylinder and multi-cylinder setups. 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 or more hydraulic cylinders bear different loads respectively, the flow divider-collector valve can still ensure their synchronous motion.

CFM Schiller valve functions

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), so that the speeds of the two actuators remain synchronized or maintain a fixed ratio. [1] The function of a flow collector valve is to collect return oil flow from two actuators in equal amounts or proportionally, 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.

CFM Schiller 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 divider valves and proportional-flow divider valves, with the commonly adopted ratio being 2:1. They can also be designed as low-flow synchronization valves according to the required ratio.

Difference between CFM Schiller 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 loaded paths; 2) The two flow sensors of a 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 a 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 a flow collector valve is exactly opposite to that of a flow divider valve; 3) The flow collector valve can only ensure synchronization during the return stroke of the actuators.

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