How does a hydraulic holding valve work?
The combined pressure from the pilot on the bore end of the cylinder and the load pressure from the rod end of the cylinder will open the load holding valve, allowing flow from the cylinder to the tank and lowering the cylinder.
What is the function of sequence valve used in hydraulic circuits?
Sequence valves can be used to sense pressure (port 1) in one circuit and then open and supply oil to a secondary circuit (port 2) at a predetermined pressure. A typical application would be when maintained clamping pressure is required in the primary circuit while work is being performed in the secondary circuit.
How does the valve work?
The simplest, and very ancient, valve is simply a freely hinged flap which swings down to obstruct fluid (gas or liquid) flow in one direction, but is pushed up by the flow itself when the flow is moving in the opposite direction. This is called a check valve, as it prevents or “checks” the flow in one direction.
What is runaway load?
If you adjust the pressure setting too quickly, you may reduce it too much and create a runaway load. The load will start to move once the pressure setting on the valve is close to the load pressure.
What is the function of a flow control valve?
A very common function of flow control valves is to control the speed of cylinders and air motors. The speed of cylinders or air motors depends on the amount of air, which can be controlled by flow control valves.
What is a counterbalance valve in hydraulic systems?
We have already discussed the important types of hydraulic valves. This section will deal with the counterbalance valves, an important valve used for holding heavy loads. Counterbalance valves are also known as load holding valves because of its ability to safely hold heavy loads.
What is the difference between Racine and Sun counterbalance?
The first was designed by Racine and has the pilot in port 1 or the nose of the cartridge. The second style that Sun adapted was conceived by Fluid Controls, and has the load port (port 1) at the nose and the pilot coming in port 3. Sun co-founder John Allen said that a counterbalance was a valve designed around a spring.
Do You stock remanufactured Racine hydraulic valves?
We stock remanufactured Racine ® hydraulic valves. Many units are in stock and available for immediate delivery. All units are fully tested and set to OEM specifications before leaving any of our facilities and are backed by an industry leading warranty.
How does a counterbalance valve with Pilot Assist work?
Counterbalance valves with pilot assist are meant to control an overrunning load. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2.