萨澳旗下插装阀品牌Comatrol应用资料(内部)

液控单向阀 vs. 平衡阀
液控单向阀 Load Holding Valve Functions: • Prevent load from dropping in case of hose or tube failure. • Prevent load from drifting caused by directional control valve spool leakage • Provide smooth, modulated motion when the load is in a lowering or run-away mode. • Provide smooth, modulated motion when the directional control valve is suddenly closed. 平衡阀
液控单向阀 – 回路提示
Locate pilot-operated check valves at or near the actuator to provide maximum load holding in the event of hydraulic line failure. Use pilot-operated check valves for load-holding, not motion (speed) control.(note 1) Do not use pilot-operated check valves with closed-center directional control valves.(note 2)
FIXED CORE “Non magnetic element”
Plunger fixed on spool
电磁阀(5)
In a 3 position solenoid valve we have a double solenoid with 2 coils.
Manual Override
FIXED CORE (Armature)
YES
YES
YES
YES
NO
YES
NO
YES
液控单向阀 – 它们如何工作
Free flow to lift load Check valve holds load Inpu百度文库 pressure on piston pilots check open for lowering
液控单向阀 – 先导比和选型
电磁驱动
线圈
Shown is a Push-Type solenoid. Operation of Pull-Type is similar.
安装注意事项
COILS
• Coil can be assembled in both positions without problem
电磁阀 & 电压
Spool-Type Solenoid Valves
• 2-way 2-position
• 3-way 2-position
• 4-way 2-position • 4-way 3-position
电磁阀 (1)
What is a SOLENOID VALVE ?
Spool
Housing
Cartridge
Recall that solenoid force is a directly proportional to electric current. The electric current flowing through the coil can be calculated by Ohm’s Law: V = I • R, otherwise written as I = V R • Example: D08 12V DC coil resistance is 9.0 at 21°C • With nominal voltage, the current is then I=12V/9.0=1.33 Amps What if the machine’s electrical load is high and the system voltage is only 9V? • Now the current is I=9V/9.0=1.00 Amps
PLUNGER FIXED CORE
电磁阀(4)
PULL MODE
When the solenoid is in PULL MODE the fixed core is in the back part of the tube; by energising the coil, the magnetic field pulls the spool forward to the fixed section.
• The pilot ratio is the ratio of the pilot piston area to the check valve seat area. • This is typically between 2.5:1 and 4:1. • These ratios will be satisfactory for 95% of all applications. • Pilot-operated check valves are generally sized based on flow and acceptable pressure drop.
支腿油缸
Schematic:
• Pilot-operated check valve for load holding. Note that load acts in one direction only (to lower hopper) • 4 way 3 position valve for lift & lower • Orifice to limit flow to 16 lpm
PUSH
PULL
电磁驱动
• When electric current flows through a wire, a magnetic field is created around the wire.
• If the wire is wound into a coil, it can be called a solenoid. If there are 100 turns of wire, the magnetic field is 100 times stronger than one wire.
支腿油缸
Use P.O. Check (not counterbalance) for cylinder!
• Flow 12 lpm, Pressure 180 bar, Leakage not specified but typical 6 drops/minute should be sufficient.
Plunger
Fixed core
Coil
Plastic Nut
电磁阀(3)
PUSH MODE
When the solenoid is in PUSH MODE the fixed core is in the frontal part of the tube; by energising the coil, the magnetic field pushes the plunger forward to the fixed section.
• Use catalog to find smallest check valve with rating > 180 bar and reasonable pressure drop at 12 lpm…RPC 04.
电磁阀 & 线圈
All used for directional control Poppet-Type Solenoid Valves • 2-way 2-position
液控单向阀 – 热膨胀
• Care must be taken when applying a pilot-operated check valve on to a cylinder where duty cycles may be low and temperatures may be high. (note 1) • In these cases, thermal expansion can cause a significant pressure increase for oil trapped between the cylinder and the pilot-operated check. (note 2) • Solutions: • Add a small thermal relief valve or use a counterbalance valve
液控单向阀 – 压力强化
• Care must be taken when applying a pilot-operated check valve on the rod end of a cylinder with a large bore:rod ratio. In extreme cases the rod pressure is intensified enough that it may be difficult to pilot open the check valve. • Use equations in Sauer-Danfoss Cartridge Valves Technical Information catalog to determine operating pressures and required pilot pressure. • If intensification creates application concerns, use a counterbalance valve.
• Sweeper
- Priority Valves - Accumulator Charging Valves • Loader - Loop Flushing Valves - Flow Divider/Combiners
• Group Sizing Exercise
• Plus / Delta
Screed Cylinder: • Lift (single acting) • Float with ~27 bar in rod end of cylinder. • Flow 24 lpm max.
Pump: • 180 bar press. comp. • Enough flow to run everything at once.
应用 – 沥青摊铺机
Screed Lift/Lower
Hopper Lift
Auger Lift
Parking Brake
沥青摊铺机阀组
Auger Cylinder: • Lift • Lower • Flow 16 lpm max. Parking Brake: • On/Off • Pressure 24 bar max. • Flow negligible Hopper Cylinder: • Lift • Lower • Flow 16 lpm max.
插装阀产品培训
HIC 培训，2008年3月
预期培训目标：
• 理解每一种插装阀产品的功能和基本用法。 • 理解每一种插装阀的典型应用。 • 明白如何去阐述样本的含义，明白如何去避免插装阀使用过程中 的一般性问题。 • 有信心和能力去满足客户的需求，绘制一个回路，以及选择正确 的元件。
议程
• Introduction • Paver Valve Example P.O. Check Valves Solenoid Valves Pressure Reducing Valves Relief Valves • Tomato Harvester - Flow Controls - Counterbalance Valves • Skid Steer Loader - Poppet Type Logic Elements • Sod Harvester - Proportional Valves - Spool Type Logic Elements • Manifold Design