Sequence valves
The sequence valve is a close relative of the pressure relief valve and is used where a set of operations are to be controlled in a pres sure related sequence. Figure 4.27 shows a typical example where a workpiece is pushed into position by cylinder 1 and clamped by cylinder 2.
Sequence valve V2 is connected to the extend line of cylinder 1. When this cylinder is moving the workpiece, the line pressure is low, but rises once the workpiece hits the end stop. The sequence valve opens once its inlet pressure rises above a preset level.
Cylinder 2 then operates to clamp the workpiece. A check valve across V2 allows both cylinders to retract together.
Incoming search terms:
Related posts:
Case studies:Variable speed drives on water pumps supplying a ring main at a domestic appliance fact...
Motors:Types of electric motors
Pumps:Reciprocating pump types
Valves and Sensors:Valve construction
Energy and Efficiency:Theory of two level systems
HYDRAULIC PUMPS:Centered Internal Gear
Erosive wear:Data sources and Issues considered.
COMPRESSORS:Dynamics
Control components in a hydraulic system:Open and closed center hydraulic circuits.
BASIC DIAGRAMS AND SYSTEMS:Hydraulic Power Drive Systems
Hydraulic fluids.
Safety, Fault-Finding and Maintenance:fault-finding Instruments
ENTROPY:ISENTROPIC PROCESSES
POWER AND REFRIGER A TION CYCLES:REFRIGERATORS AND HEAT PUMPS
FORCED CONVECTION:GENERAL CONSIDERATIONS FOR PIPE FLOW