Ball Gate Globe Control Valves

	Ball Valves	A ball valve (like the butterfly valve, one of a family of valves called quarter turn valves) is a valve that opens by turning a handle attached to a ball inside the valve. The ball 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 position lets you "see" the valve's position.
	Gate Valves	A gate valve is a valve that opens by lifting a round or rectangular gate out of the path of the fluid. Gate valves are sometimes used for regulating flow, but many are not suited for that purpose, having been designed to be fully opened or closed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.
	Globe Valves	Globe valves are named for their spherical body shape. The two halves of the valve body are separated by a baffle with a disc in the center. Globe valves operate by screw action of the handwheel. They are used for applications requiring throttling and frequent operation. Since the baffle restricts flow, they're not recommended where full, unobstructed flow is required.
	Contol Valves	Also known as the final control element. A power-operated device used to modify the fluid flow rate in a process control system. It usually consists of a body or valve and an actuator, which responds to a signal from the controlling system and changes the position of a flow contolling element in the valve.
	Check Valves	A check valve is a mechanical device, a valve, that normally only allows fluid to flow through it in one direction. A double check valve is often used as a backflow prevention device to keep potentially contaminated water from siphoning back into municipal water supply lines. A clapper valve is a type of check valve used in or with firefighting, and has a hinged gate (often with a spring urging it shut) that will only remain open in the outflowing direction.
	Relief Valve	The relief valve is a type of valve used to control or limit the pressure in a system by allowing the pressure source fluid to flow from an auxiliary passage, away from the main flow path. The relief valve is designed or set to open at a predertermined pressure to protect pressure vessels and other equipment from being subjected to pressures that exceed their design limits. When the pressure setting is exceed, the relief valve becomes the "path of least resistance" as the valve is forced open and a portion of the fluid is diverted through the auxiliary route. Thediverted fluid (liquid,gas or liquid-gas mixture) is usally routed through a pipping system known as a flare header to a central, elevated gas flare where it is burned and the resulting combustion gases are released to the atmosphere.
	Butterfly Valves	A Butterfly valve is a type of flow control device, used to make a fluid start or stop flowing through a section of pipe. The valve is similar in operation to a ball valve. A flat circular plate is positioned in the center of the pipe. The plate has a rod through it connected to a handle on the outside of the valve. Rotating the handle turns the plate either parallel or perpendicular to the flow of water, shutting of the flow.
	Solenoid Valves	A solenoid valve is an electromechanical valve for use with liquid or gas controlled by running or stopping an electric current through a solenoid, which is a coil of wire, thus changing the state of the valve. The operation of a solenoid valve is similar to that of a light switch, but typically controls the flow of air or water, whereas a light switch typically controls the flow of electricity. Solenoid valves may have two or more ports: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports.
	Air Valves	An air release valve is open when the system is depressurized. At start up, the liquid process forces most of the air in the pipeline to high points, where the ARV allows it to escape. Once liquid rises, the valve closes and will not allow anything—gas or liquid—to pass in or out. It will not vent gas as it occurs during daily operations. It will reopen when the system is depressurized and liquid level drops.
	Needle / Manifolds Valves	Needle Valves have a slender, tapered point at the end of the valve stem that is lowered through the seat to restrict or block flow. Fluid flowing through the valve turns 90 degrees and passes through an orifice that is the seat for a rod with a cone shaped tip. These small valves are widely used to accurately regulated the flow of liquids and gases at low flow rates. The fine threading of the stem and the large seat area allow for precise resistance to flow. Needle Valve are used to contol flow into delicated gauges, which might be damaged by sudden surges of fluid under pressure. Needle Valves are also used in situations where the flow must be gradually brought to a halt, and at other points where precise adjustments of the flow are necessary or where a small flow rate is desired. They can be used as both on/off valves and for throttling service. Manifolds are fluid distribution devices. They range from simple supply chambers with several outlets to multi-chambered flow control units including integral valves and interfaces to electronic networks. Manifolds are generally configured gor serveral outlets sharing one inlet or supply chamber;exhaust manifolds can have several inlets sharing one exhaust port. They may have one or more shared supply chambers and any number of outlets. Complex pneumatic and hydraulic circuits can utilize manifolds with interfaces to sophisticated electronic networks. Applications, port spectifications, flow and pressure specifications, manifold circut style, and valve specifications are all important parameters to consider when searching for msnifolds. Additional specfications to consider for maniflods include communication network,body materials, features, and operating temperature.