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:REVIEW QUESTIONS 1. A 3-way, 2-position directional control valve cannot be used to a. b. select between two power sources. select between two branch circuits. C. adjust pressure in two branch circuits. start and stop an actuator. vo d 2. A 3-way, 2-position directional control valve (a, can be spring return. b. can be used to adust pressure in two different branch circuits. cannot be shifted manually. d. has two ports. C. 3. A 3-way, 2-position directional control valve can have a. three envelopes and two fluid ports. b. three envelopes and three fluid ports. C. two envelopes and three positions. d. two envelopes and three fluid ports. 4 The devices used to shift the spool of directional control valves are called a valve actuators. b. valve controls. C. valve pilots. d. levers 5. In a 3-way, 2-position directional control valve, how many flowpath configurations are possible? a. 1 6. 2 C. 3 d. 6 REVIEW QUESTIONS 1. A single-acting cylinder a. b. C. converts fluid power to rotary motion can both extend and retract under power. relies on a spring or a load to return the cylinder to its original position. requires the use of a 3-way, 3-position directional control valve 2. Cap-end and rod-end refer to a b. the two ends of a fluid power cylinder the two ends of a fluid power circuit. C. single-acting cylinders only. the fluid ports of a fluid power motor. d. 3. A double-acting cylinder a. requires the use of a 3-way, 3-position directional control valve. b. converts linear mechanical energy into rotary mechanical energy during extension and retraction. C. contains one fluid port and a breather element. d. converts fluid power energy into linear mechanical energy during extension and retraction. 4. The meter-out configuration controls the flow rate a. entering an actuator. b. leaving an actuator. C entering and leaving an actuator. d. None of the above. 5. The meter-in configuration is used to control actuator speed where the actuator constantly works a. vertically b. horizontally c. slowly d. against the load. 1. What is the purpose of an intensifier? a. To produce low pressure from a high pressure source. b. To increase the temperature of compressed air. To produce a high pressure from a low pressure source. d. To increase the volume of compressed air. 2. Which of the following determines the pressure multiplication possible with an intensifier? a. b. The slave cylinder The master cylinder. The bore of the cylinder. The ratio of areas. C. d 3. Two cylinders can be synchronized a. using loads. b. using directional control valves. connecting them in series. Answers a and c. 4. The low-pressure side of an intensifier is called a. master cylinder. b. slave cylinder C. cylinder cap-end. d. cylinder rod-end. 5. If two cylinders connected in series are of the same size and stroke, the downstream cylinder will extend a faster. b. slower. at exactly the same speed. d. farther REVIEW QUESTIONS 1. Which of two identical cylinders connected in parallel will extend first? a. The cylinder with the lower load. b. The cylinder with the higher load. C. It depends on the flow rate. d. Neither, they will be synchronized. 2. One mechanical method of synchronizing parallel cylinders is called a. synchronizer b. mechanical method. mechanical yoke method. d. parallel method. 3. Parallel cylinders can be synchronized using a. directional control valves. b. check valves. Cflow control valves. d. shutoff valves. ne bote 4. Two cylinders connected in parallel should operate in synchronization if a. they are identical in size. b. they both receive the same flow rate. c. they are evenly loaded. d. all of the above. 5. When cylinders are connected in parallel, a. the rod ends of each cylinder are connected together. b. the cap ends of each cylinder are connected together. C. the rod ends and the cap ends of each cylinder are connected together. d. the rod end of one cylinder is connected to the cap end of the other cylinder.
Directional control valves are used to control the direction and movement of hydraulic fluid through a system. They are often referred to as switching valves, and come in three main categories: hydraulic check valves, directional spool valves and poppet valves that make up the different types of control valves.
There are five major points to consider when it comes to analysing the performance and suitability of directional control valves:
Check valves are the simplest and most common form of directional control valve which are regularly used in hydraulic systems. These valves can be used to stop the flow of liquid in one direction, whilst still allowing the free flow of fluid in the opposite direction. These models are also commonly known as non-return valves.
Hydraulic check valves can also fulfil a range of other roles within a hydraulic system, including:
Most check valves are spring-loaded, and rely on a ball or plate to seal the flow in a single direction. Check valves are designed to be able to reliably isolate circuits without running the risk of leakage. A range of different elements, including poppets with soft seals can also be used within these valves to isolate circuits.
These kinds of directional control valves are composed of a moving spool which is situated inside the housing of a valve. An actuating force then moves the control spool, which allows the channels within the housing to be connected or separated. These types of directional control valves have a range of unique features which makes them suitable for different conditions, including:
These types of control valves can be either directly-operated or pilot-operated. These valves can be connected with solenoids or mechanically controlled via levers and rollers, or via hydraulic or pneumatic systems.
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These types of control valves are fitted into housing bores with a threaded connection, which is why they are commonly referred to as cartridge valves. These valves are suitable for operating situations of up to 1,000bar and can contain a range of seating elements, including balls, poppets and plates.
Just some of the key features which make these models extremely useful can include:
Their design allows these valves to become more tightly sealed when the operating pressure increased. Compared to other kinds of control valves, their maximum flow is often limited, making them unsuitable for systems which require high flow rates.
Here at Flowfit, we can provide a diverse range of valves, including hydraulic check valves for a diverse range of systems and applications. For more information, please don&#;t hesitate to get in touch with our professional team of hydraulic specialists today on 876 033.
Alternatively, you can any questions or concerns to and we&#;ll get back to you as soon as we can!
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