700 bar | For Applications Where Pressure Drops Must Be Avoided | Two Models: VSM-11 and VSM-21
The Yale VSM range provides safety-check valves rated for 700 bar, used for applications where pressure drops (such as holding of a lifted load) must be avoided. Yale supplies two models: the VSM-11 for direct screw-in to a cylinder oil port (working as a hose-break fuse), and the VSM-21 for combination with VHP directional valves.
Prevents pressure drops on lifted loads
Yale documentation describes the VSM safety-check valves as used where pressure drops must be avoided. The VSM-11 can be directly screwed into the oil port of a hydraulic cylinder and works at this location as a hose-break fuse. The VSM-21 design is suitable for combination with VHP directional valves and at that location ensures pressure is held precisely with no drops caused by operating the directional valve.
Per Yale: VSM-11 for safety-critical lifting where a hose burst would cause uncontrolled load drop. VSM-21 combined with VHP directional valves on power packs for precise pressure holding. Operation: after closing the relief valve (hand wheel), the cylinder advances via the by-pass. In direction to the cylinder, valves always have free flow. The built-in check valve ensures a pressurized cylinder is held precisely in stop position. A smooth lowering speed is adjusted by opening the throttle valve (hand wheel). A safety pressure valve protects the cylinder from being overloaded by external loading.
| Maximum Operating Pressure | 700 bar |
|---|---|
| Dimensions (both models) | 75 x 25 x 100 mm |
| VSM-11 | Cylinder side: 3/8 NPT outer; Pump side: 3/8 NPT inner; 0.9 kg - for direct cylinder mounting |
| VSM-21 | Cylinder side: 3/8 NPT inner; Pump side: 3/8 NPT outer; 1.0 kg - for VHP valve combinations |
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