A Globe Valve Is A Type Of Valve Used For Regulating Flow In A Pipeline, Consisting Of A Movable Disk-Type Element And A Stationary Ring Seat In A Generally Spherical Body. Globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. This has an opening that forms a seat onto which a movable plug[2] can be screwed in to close (or shut) the valve. The plug is also called a disc or disk.In globe valves, the plug is connected to a stem which is operated by screw action in manual valves. Typically, automated valves use sliding stems. Automated globe valves have a smooth stem rather than threaded and are opened and closed by an actuator assembly. When a globe valve is manually operated, the stem is turned by a hand wheel. Although globe valves in the past had the spherical bodies which gave them their name, many modern globe valves do not have much of a spherical shape. However, the term globe valve is still often used for valves that have such an internal mechanism. In plumbing, valves with such a mechanism are also often called stop valves since they don't have the global appearance, but the term stop valve may refer to valves which are used to stop flow even when they have other mechanisms or designs. Globe valves are used for applications requiring throttling and frequent operation. For example, globe valves or valves with a similar mechanism may be used as sampling valves, which are normally shut except when liquid samples are being taken. Since the baffle restricts flow, they're not recommended where full, unobstructed flow is required..

Check Valve, Clack Valve, Non-Return Valve Or One-Way Valve Is A Mechanical Device, A Valve, Which Normally Allows Fluid ( Liquid Or Gas ) To Flow Through It In Only One Direction. Backwater valve   (for sanitary drainage system) protects lower located rooms against flooding caused by return flow of sewage waters. Such risk occurs most often in sanitary drainage systems connected to combined sewerage systems and in rainwater drainage systems. It may be caused by intense rainfall, thaw or flood. Backwater valve prevents rats and other rodents entering the sanitary and rainwater drainage systems and, consequently, the building interiors. It protects also against unpleasant smells in case of longer breaks in system use. A   ball check valve   is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check valves, the ball is   spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal. The interior surface of the main seats of ball check valves are more or less conically-tapered to guide the ball into the seat and form a positive seal when stopping reverse flow. Ball check valves are often very small, simple, and cheap. They are commonly used in liquid or gel minipump dispenser spigots, spray devices, some rubber bulbs for pumping air, etc., manual air pumps and some other   pumps, and refillable dispensing syringes. Although the balls are most often made of metal, they can be made of other materials, or in some specialized cases out of artificial   ruby. High pressure   HPLC   pumps   and similar applications commonly use small inlet and outlet ball check valves with both balls and seats made of artificial ruby, for both hardness and chemical resistance. After prolonged use, such check valves can eventually wear out or the seat can develop a crack, requiring replacement. Therefore, such valves are made to be replaceable, sometimes placed in a small plastic body tightly-fitted inside a metal   fitting   which can withstand high pressure and which is screwed into the pump head. There are similar check valves where the disc is not a ball, but some other shape, such as a   poppet   energized by a spring. Ball check valves should not be confused with   ball valves, which is a different type of valve in which a ball acts as a controllable rotor to stop or direct flow. .

TYPE of Valves : 2 way, 3 way, 4 way, 5 way, 1 piece, 2 piece, 3 piece Design. Quarter turn, Half turn, Full turn i.e. L Port 900, T Port ( full turn ) A Ball Valve Is A Valve With A Spherical Disc, The Part Of The Valve Which Controls The Flow Through It. The Sphere Has A Hole, Or Port, Through The Middle So That When The Port Is In Line With Both Ends Of The Valve, Flow Will Occur. When The Valve Is Closed, The Hole Is Perpendicular To The Ends Of The Valve, And Flow Is Blocked. The Handle Or Lever Will Be Inline With The Port Position Letting You "See" The Valve's Position. The Ball Valve, Along With The Butterfly Valve And Plug Valve, Are Part Of The Family Of Quarter Turn Valves. Types of ball valve There are five general body styles of ball valves: single body, three piece body, split body, top entry, and welded. The difference is based on how the pieces of the valve—especially the casing that contains the ball itself—are manufactured and assembled. The valve operation is the same in each case. Duplex ball valve In addition, there are different styles related to the bore of the ball mechanism itself: A full port or more commonly known full bore ball valve has an over-sized ball so that the hole in the ball is the same size as the pipeline resulting in lower friction loss. Flow is unrestricted but the valve is larger and more expensive so this is only used where free flow is required, for example in pipelines which require pigging. In reduced port or more commonly known reduced bore ball valves, flow through the valve is one pipe size smaller than the valve's pipe size resulting in flow area being smaller than pipe. As the flow discharge remains constant and is equal to area of flow (A) times velocity (V), A1V1 = A2V2 the velocity increases with reduced area of flow Three-way and four-way ball valves Schematic 3 way ball valve: L-shaped ball right, T-shaped left Three-way ball valves have an L- or T-shaped hole through the middle. The different combinations of flow are shown in the figure. It is easy to see that a T valve can connect any pair of ports, or all three, together, but the 45 degree position which might disconnect all three leaves no margin for error. The L valve can connect the center port to either side port, or disconnect all three, but it cannot connect the side ports together. Multi-port ball valves with 4 ways, or more, are also commercially available, the inlet way often being orthogonal to the plane of the outlets. For special applications, such as driving air-powered motors from forward to reverse, the operation is performed by rotating a single lever four-way valve. The 4-way ball valve has two L-shaped ports in the ball that do not interconnect, sometimes referred to as an "×" port. Ball valves in sizes up to 2 inch generally come in single piece, two or three piece designs. One piece ball valves are almost always reduced bore, are relatively inexpensive and generally are throw-away. Two piece ball valves are generally slightly reduced (or standard) bore, they can be either throw-away or repairable. The 3 piece design allows for the center part of the valve containing the ball, stem & seats to be easily removed from the pipeline. This facilitates efficient cleaning of deposited sediments, replacement of seats and gland packings, polishing out of small scratches on the ball, all this without removing the pipes from the valve body. The design concept of a three piece valve is for it to be repairable.....

A Butterfly Valve is a Valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly Valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. A Butterfly Valve Is A Valve Which Can Be Used For Isolating Or Regulating Flow. The Closing Mechanism Takes The Form Of A Disk. Operation Is Similar To That Of A Ball Valve, Which Allows For Quick Shut Off. Butterfly Valves Are Generally Favored Because They Are Lower In Cost To Other Valve Designs As Well As Being Lighter In Weight, Meaning Less Support Is Required. The Disc Is Positioned In The Center Of The Pipe, Passing Through The Disc Is A Rod Connected To An Actuator On The Outside Of The Valve. Rotating The Actuator Turns The Disc Either Parallel Or Perpendicular To The Flow. Unlike A Ball Valve, The Disc Is Always Present Within The Flow, Therefore A Pressure Drop Is Always Induced In The Flow, Regardless Of Valve Position. A Butterfly Valve Is From A Family Of Valves Called Quarter-Turn Valves. The "Butterfly" Is A Metal Disc Mounted On A Rod. When The Valve Is Closed, The Disc Is Turned So That It Completely Blocks Off The Passageway. When The Valve Is Fully Open, The Disc Is Rotated A Quarter Turn So That It Allows An Almost Unrestricted Passage Of The Fluid. The Valve May Also Be Opened Incrementally To Throttle Flow. There Are Different Kinds Of Butterfly Valves, Each Adapted For Different Pressures And Different Usage. The Resilient Butterfly Valve, Which Uses The Flexibility Of Rubber, Has The Lowest Pressure Rating. The High Performance Butterfly Valve, Used In Slightly Higher-Pressure Systems, Features A Slight Offset In The Way The Disc Is Positioned, Which Increases The Valve'S Sealing Ability And Decreases Its Tendency To Wear. The Valve Best Suited For High-Pressure Systems Is The Triple Offset Butterfly Valve, Which Makes Use Of A Metal Seat, And Is Therefore Able To Withstand A Greater Amount Of Pressure