Articles

What is a double acting steam engine?

What is a double acting steam engine?

A double-acting cylinder is a cylinder in which the working fluid acts alternately on both sides of the piston. Double-acting cylinders are common in steam engines but unusual in other engine types. Many hydraulic and pneumatic cylinders use them where it is needed to produce a force in both directions.

What is lap and lead?

Now, from the outside edge of the ports to the end of the valve, is the outside lap. By the lead of a valve is meant that the port is opened a little in advance of the piston, or the port is open for one stroke before the piston has quite finished the preceding one.

What are the two types of valve gear?

Dual eccentric gear (Stephenson-type gears)

  • Stephenson valve gear – most common valve gear in the 19th century, normally inside the locomotive frame.
  • William T. James valve gear 1832, used first by Baltimore and Ohio Railroad, United States.
  • Allan valve gear, a straight-link valve gear.
  • Gooch valve gear.

What is the purpose of D slide valve?

The slide valve is a rectilinear valve used to control the admission of steam into and emission of exhaust from the cylinder of a steam engine.

Where are double acting cylinders used?

Double-acting cylinders are typically used in all applications where the thrusts and stroke lengths required are in excess of those available from single-acting cylinders. Small double-acting cylinders are also used for applications where positive end-of-stroke positions are required for both strokes.

What is the difference between a single acting steam engine and a double acting steam engine?

Double-Acting – have a port at each end, supplied with hydraulic fluid for both the retraction and extension. Single-Acting – hydraulic fluid enters through a port at one end of the cylinder, which extends the rod by means of area difference.

What is the difference between globe valve and piston valve?

Piston valve resembles in construction more towards a globe valve and is mainly used for shut off and regulation. This valve provides positive shut off. The shut off assembly comprises of a metal piston, two resilient valve rings and a metal lantern bush.

Is a piston a valve?

A piston valve is a device used to control the motion of a fluid along a tube or pipe by means of the linear motion of a piston within a chamber or cylinder. Examples of piston valves are: The valves used in many brass instruments. The valves used in pneumatic cannons.

What is valve Gearbox?

A gearbox is an actuator that produces a mechanical advantage through a series of gears resulting in reduced input torque to operate a valve. Gearboxes can be driven via a manual handwheel or electric multiturn actuator. Reversing gearboxes are also available.

How does a piston valve work?

The inside of a piston valve contains a piston that blocks the output when the valve is pressurized, and a volume of air behind the piston. When the pressure behind the piston is released the piston is pushed back by the force of the pressure from the input.

What is valve and types?

Valves are mechanical devices that controls the flow and pressure within a system or process. Different types of valves are available: gate, globe, plug, ball, butterfly, check, diaphragm, pinch, pressure relief, control valves etc.

How does a double acting steam engine work?

Double-acting Steam Engine The steam is entered on both sides of the piston and during each revolution of the crankshaft two working strokes are produced it is known as a double-acting steam engine. The double-acting steam engine produces twice the power than produced by a single-acting steam engine.

What kind of valve does a steam engine use?

Solenoid Valve. See Steam Engine Design/Solenoid. Computer controlled solenoid valves allow complete control over steam admission into a cylinder. An earlier version of the Steam Engine Design/2009 was focused on using solenoids as the control mechanism.

How are steam engines classified by their action?

Steam engines may be classified according to the following considerations: (i) By Position of the Axis of the Cylinder- Vertical, horizontal or inclined. (ii) By the Action of Steam on the Piston- Single acting or double acting.

How many cylinders does a steam engine have?

Engines of this type usually have multiple cylinders in an in-line arrangement, and may be single- or double-acting.