Valves
Flow Valves
Flow valves from Bosch Rexroth determine the flow rate and thus the speed of cylinders and hydraulic motors. Throttle valves work with an adjustable cross-section, flow control valves of the 2FRM and 2FRE series keep the set flow constant via an integrated pressure compensator, independent of the load pressure.
The range also includes MG and MK throttle and throttle check valves for in-line mounting, F throttle valves for subplate mounting, sandwich plates such as Z2FS and Z2FRM, and ZDC sandwich plate pressure compensators, which together with a proportional directional valve provide load-independent flow control. Electrically proportional flow control valves are listed in the subcategory.
- 450 items
- 1 subcategory
- 1 manufacturer
- Net prices plus VAT
Buying guide
How to choose Flow Valves
What matters when choosing: properties, comparison and typical applications.
Selection criteria
| Criterion | Options | What to look for |
|---|---|---|
| Function | throttle valve, throttle check valve, 2-way flow control valve, pressure compensator | Throttling is enough for constant loads, with changing loads a flow control valve keeps the speed. |
| Adjustment | mechanical (2FRM), electrically proportional (2FRE) | Proportional adjustment when speeds are set by the machine control. |
| Design | subplate mounting, sandwich plate (Z2FS, Z2FRM, ZDC), in-line G 1/4 to G 1 (MG, MK) | Sandwich plates are fitted into the valve stack under a directional valve. |
| Seal | NBR, FKM | FKM for higher temperatures and special fluids. |
Frequently asked questions
- What is the difference between a throttle valve and a flow control valve?
- With a throttle valve the flow depends on the pressure drop across the throttle and changes with the load. A flow control valve compensates load changes with a pressure compensator and keeps the flow constant.
- What is a ZDC sandwich plate pressure compensator for?
- The ZDC is fitted under a proportional directional valve and keeps the pressure drop across the valve constant. The flow then depends only on the setpoint, not on the load.
- When is a throttle check valve used?
- It throttles the flow in one direction only and lets it pass freely in the other, for example to extend a cylinder slowly and retract it quickly.