The dual-pressure valve is switched through (AND function) when signals are applied to both inputs 1. If different pressures are applied to the two inputs, then the lower pressure reaches the output 2.
What is a shuttle valve used for?
Shuttle and fast exhaust valves
A shuttle valve, also known as a double-check valve, allows pressure in a line to be obtained from alternative sources. It is primarily a pneumatic device and is rarely found in hydraulic circuits.
What is an excess pressure valve?
An excess pressure valve is used to control the upstream pressure (p1) to an adjusted set point. The design of an excess pressure regulator valve is to open when the upstream pressure rises above the set value.
What is a 3 2 way valve?
A 3/2-way valve has three ports and two positions that can be driven pneumatically, mechanically, manually or electrically via a solenoid valve. They are used, for example, to control a single-action cylinder, driving pneumatic actuators, blow-off, pressure release and vacuum applications.
What is check valve used for?
What is a check valve? Check valves are generally installed in pipelines to prevent backflow. A check valve is basically a one-way valve, in which the flow can run freely one way, but if the flow turns the valve will close to protect the piping, other valves, pumps etc.
How does a pressure sequence valve work?
The sequence valve would use a pressure signal to shift the spool and thereby opening or closing a flow path at a preset pressure. So this valve could divert the flow in a predetermined sequence it can operate the cycle of a machine automatically.
Is a shuttle valve an AND logic valve?
The shuttle valve is essentially an OR logic element (see above). One input or the other becomes the output, usually a pilot signal that controls a normally open or normally closed valve. The circuit shown is an OR circuit, with the OR elements (shuttle valves) connected to a normally closed valve.
Why do two pressure valves have two inputs?
A two pressure valve requires two pressurised inputs to allow an output from itself. This is achieved by a similar system to the one shown below, one active input slides the shuttle valve shut blocking any air flow, add two active inputs and the shuttle remains centralised allowing flow through the valve.
What is counterbalance valve?
Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. They are designed to create backpressure at the return line of the actuator to prevent losing control over the load.
What are the features of relief valve?
A Relief Valve is a pressure relief device actuated by inlet static pressure having a gradual lift generally proportional to the increase in pressure over opening pressure. It may be provided with an enclosed spring housing suitable for closed discharge system application and is primarily used for liquid service.
What is a 2 way 2 position valve?
A 2-way 2 position valve is known as a 2/2 valve. A basic example of a 2/2 valve is a ball valve. A basic ball valve has two ports (in and out) along with two positions (open or closed). 3/2 Valves. A 3-way 2 position valve is known as a 3/2 valve.
What is a 4 way 2 position valve?
4-way valves have 4 ports; Pressure (P), Tank (T), Advance (A) and Retract (B). The 2 positions are used to control the advance and retract of the tool or cylinder. When a hold position is needed, you should choose a valve with an additional 3rd position.
What is a 2 way valve used for?
2 way valves are commonly found in basic on/off applications, where they are frequently referred to as isolation valves. These valves are an essential component in many process safety systems, as they can immediately stop fluid flow to a specific location in the event of an emergency.
What are the 5 types of check valves?
Most common types of Check valves are swing, lift (piston and ball), butterfly, stop and tilting-disk.
What is scour valve?
Scour valves are located at low points or between valved sections of the pipeline. Their function is to allow periodic flushing of the lines to remove sediment and to allow the line to be drained for maintenance and repair work.
What is the another name of check valve?
A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.
