
	Where results make sense

Topic: Control valve

	FLUID KINETIC ENERGY AS A SELECTION CRITERIA FOR CONTROL VALVES (Site not responding. Last check: 2007-11-03)
		The throttling area of the original valve was the annulus area between the plug and the seat ring.
		Thus, the valve pressure drop was increased to a value equivalent to the original trim and the orifice.
		The valve instrumented was a steam valve with a flow to open trim consisting of three concentric cages with drilled holes in each cage.
	www.iceweb.com.au /Valve/fluid_kinetic_energy.htm (3678 words)

	Proportional Flow Control Valve -- South Bend Controls
		The valve is useful for a wide range of viscosities and fluids due to the knife edge variable orifice.
		This valve is configured to use a 35 ohm coil and operate to 100% rated flow capacity at 600 milliamps.
		This proportional flow control valve may be used to control a variety of both liquid and gaseous fluids.
	www.sbcontrols.com /proportional_flow_control.html (581 words)

	flow control valve (Site not responding. Last check: 2007-11-03)
		The valve is controlled by pilot valve, which takes use of integrated orifice plate to detect flow rate represented by differential pressure, and the differential pressure is used to control the pilot valve to implement flow rate control.
		The 400X flow control valve is a multifunctional valve that adopts the mode of flow control employed by high-precision pilot valve.
		This valve differs from other conventional throttle valve, which normally work through reducing the flow area by means of orifice plates or purely mechanically, by making use of an appropriate pilot valve to minimize the loss of energy in the course of flow regulation.
	www.flow-control-valve.com (256 words)

	Control valve technology
		Renewed interest in the performance of control valves is emerging, partly as a result of numerous plant audits that indicate roughly one-third of installed control valves are operating at substandard levels.
		Rotary-shaft control valves are available in several different types, each characterized by the geometry of the closure member (disk, ball, ball segment or plug).
		Control valve selection is based on the process fluid to be handled and a number of performance objectives.
	www.plantservices.com /articles/2003/124.html (1327 words)

	What's Your Flow Control Valve Telling You?
		It is worse for rotary valves because of the gaps in rack and pinion gear teeth, the slots in scotch yoke actuators, the key locks in shaft-stem connections, and the linkage that transfers vertical actuator shaft motion to disc, plug or rotary ball movement.
		Control valves designed for on-off operation generally are a poor choice for a control valve.
		The control valve that responds best to small changes is a judiciously sized sliding stem (globe) valve with a digital positioner and a correctly sized diaphragm actuator and properly tightened Teflon packing.
	www.controldesign.com /articles/2003/164.html (2847 words)

	Valve - Wikipedia, the free encyclopedia
		Although valves are sometimes made connected or integral with some other object like a vessel, many valves are manufactured initially as a separate item to be connected afterwards to some other object such as a pipe, tube, or pump head on at least one of the valve ports either by a manufacturer or the user.
		Valve sizes are commonly given by the outer diameter of tubing or pipng the ports connect to; for example, a 1-inch valve is sized to connect to 1-inch outer diameter tubing.
		However, valves may eventually wear out from use and develop a leak, either between the inside and outside of the valve or, when the valve is shut to stop flow, between the disc and the seat.
	en.wikipedia.org /wiki/Valve (2773 words)

	Directional Control Valve FAQ's (Site not responding. Last check: 2007-11-03)
		A directional control valve is the extend and retract control for your hydraulic cylinders.
		The center position on 3x4 solenoid valves is the position that the valve rests in with both solenoids de-energized.
		On manual valves the center position is transitional and is often unused.
	www.vektek.com /secure/dvalvefaq.htm (780 words)

	Control Valve Info
		These valves have a spring loaded locking feature and are designed to lock into place when the valve is in the OFF position.
		If a problem occurs with the valve lock not releasing, check that the valve stem extends sufficiently from the control panel and is allowing full depression of the control knob which releases the locking device.
		Replacement is necessary if a control valve becomes broken or frozen and replacements for some models are available individually or may occasionally require replacement as a set.
	www.grillparts.com /howto/valve.asp (435 words)

	Pneumatic Control Valves on Jordan Valve, Div. of Richards Industries, Inc.
		The MK70 Series is a line of pneumatically-operated diaphragm control valves that combine multiple spring actuators with the precision of Jordan Valve’s advanced sliding gate seat for closer control and greater accuracy.
		The valve strokes in a fraction of the travel required by conventional control valves...
		As a mixing valve, it is designed with two inlets to blend two separate flow streams into a common outlet, creating a third fluid.
	jordanvalve.thomasnet.com /category/pneumatic-control-valves (1168 words)

	Valve Positioners
		The controller can be used on single- or double-acting actuators and uses FOUNDATION fieldbus communications protocol for easy access to information critical to the process operation.
		The electro-pneumatic valve positioner receives an electronic input signal from a control device and modulates the supply pressure to the control valve actuator, providing an accurate valve stem position that is proportional to the pneumatic input signal received from a control device.
		The pneumatic valve positioner receives a pneumatic input signal from a control device and modulates the supply pressure to the control valve actuator, providing an accurate valve stem position that is proportional to the pneumatic input signal.
	www.emersonprocess.com /fisher/products/valvepositioners/index.html (736 words)

	OCV \| Solenoid Control Valve Series 115
		The OCV Series 115 Solenoid Control Valve is designed to provide on/off or open/close control of fluids in response to an electrical signal.
		OCV Control Valves was founded more than 50 years ago with a vision and commitment to quality and reliability.
		In fact, OCV Valves can be found in some capacity in nearly every country around the world from fire protection systems in Malaysia to aircraft fueling systems in Africa and from oil refineries in Russia to water supply systems in the USA and Canada.
	www.controlvalves.com /series/115/115.html (419 words)

	Boiler Water Control Valve Selection
		Hubbell Model BW indirect fired water heaters are factory furnished with a boiler water control system to regulate the flow of boiler water through the heating coil.
		A self-operated control valve allows only the required amount of boiler water into the heating coil in order to satisfy the demand.
		The thermostat is wired into the control circuit of the circulation pump and will close the control circuit when heat is required (thereby turning the pump on) and will open the control circuit when the water temperature in the storage vessel reaches the thermostat set point, thereby turning the pump off.
	www.hubbellheaters.com /html/bwvalve.htm (213 words)

	RF Valve (Site not responding. Last check: 2007-11-03)
		valve, is also operable with either an analog or digital signal in both pressure and vacuum environments.
		A proportional pressure controller is all that is required to achieve outstanding performance in services where line pressure does not exceed 50 psi.
		Control performance is also enhanced, as each valve is uniquely characterized to flow requirements with either full- or reduced-port designs, thus reducing the turbulence and cavitation found in other valve designs.
	www.rfvalve.com /control_valves.htm (421 words)

	Hydraulic control valve (Site not responding. Last check: 2007-11-03)
		Hydraulic control valves as used in industrial applications are built in several pressure ranges.
		Various types of valves are used in hydraulic systems to control or regulate the flow medium.
		Hydraulic valves with a tandem center connect the pressure and tank ports, but block the service ports to allow system unloading and isolation of the service lines.
	www.cgvalve.cn /Hydraulic-control-valve.html (192 words)

	Cashco Control Valve Concepts (Site not responding. Last check: 2007-11-03)
		A Control Valve is a power-operated device used to modify the fluid flow rate in a process system.
		When a Control Valve is sized or selected to do a particular job, one of the first questions you should consider is how that valve will respond in the event of a loss of signal or power.
		By the comments one hears, you would be led to believe that control valves sit around and think up things to do on their own.
	www.maintenanceresources.com /ReferenceLibrary/ControlValves/CashcoControlPg1.htm (472 words)

	Coen \| AC Flow Control Valve
		The Coen AC Flow Control Valve (Adjustable Characteristic) is the result of over forty years of continuous development and improvement.
		The present AC Valve provides all of these features with the addition of reverse acting lever operation, low operating torque (approximately 30 inch pounds), flexibility of installation, compactness, a balanced piston type valve plug with characterized valve ports, and mechanical and material refinements for unequaled service.
		In this system, a constant differential valve upstream of the AC valve (with pressure taps across the AC valve) meters fuel flow on the principle that for a constant pressure differential, flow will be proportional to orifice (or valve opening) size.
	www.coen.com /i_html/acvalve.html (652 words)

	valve sizing calculators for gas CV, liquid CV and steam CV
		Cv numbers are valve coefficients that define the maximum capacity of a valve.
		A valve with a Cv of one has a capacity of one GPM of water at one PSI pressure drop.
		Choose a control valve with a operating Cv between 20 to 80 percent of port opening.
	www.a-tcontrols.com /products/valve_sizing (255 words)

	Automated Valve and Control (AVC) - AUMA, RCS, Grinnell, Bettis, DynaTorque, Babbit, and many more
		Automated Valve and Control AVC is the oldest actuation house in the city of Houston.
		AVC designs and fabricates actuator mounting hardware for virtually any actuator valve assembly, or application, and is capable of completing the conversion of your valve into an automated valve system, per you or your customer’s specifications.
		Automated Valve’s technicians are factory certified members of the RCS (Raymond Control Systems) and AUMA service center networks.
	www.automatedvalvecontrol.com (300 words)

	Control Valve Suppliers and Installers: Scotland & UK
		The Control Valve Experts in the UK We supply control valves for all industrial applications, together with actuators, transmitters and controllers for installations delivering maximum efficiency and optimum performance.
		Our expertise in control valve technology and installation enables many UK companies and utilities to achieve and exceed even the most demanding of efficiency and reliability targets.
		Control valve systems and solutions from CandPS Ltd are designed and rigorously tested to comply with the most stringent specifications.
	www.control-valve.co.uk (173 words)

	OCV Control Valves - Global Performance. Personal Touch. - HOME
		OCV valves can be found in some capacity in nearly every country throughout the world.
		With over 50 years experience in the design, manufacturing and application of control valves our focus is to provide the best valves with the finest customer service.
		This is evident by the fact that OCV Control Valves is ISO 9001 certified.
	www.controlvalves.com (126 words)

	Control Valve
		The Score Group have their Control Valve and Diagnostic division centred in Perth, Australia.
		Control valves sizing is a highly specialised area that requires years of experience combined with sophisticated simulation software.
		All valve and actuator sizing calculations are done independently using ISA 570.03 formulas and methodology.
	www.scorepacific.com.au /ControlValve.htm (496 words)

	Control Valve Accessories \| Robertshaw Industrial Products
		The P2 side mounted valve positioner is a positive positioning relay for use with pneumatically operated valves and actuators.
		The 443A and 445A current-to-pneumatic transducers convert a mADC signal to a proportional pneumatic signal.
		The DT 700 series pilot temperature controllers provide accurate, dependable temperature control when used with various final control elements such as valves.
	www.robertshawindustrial.com /pages/products/valves/accessories.asp (79 words)

	Automatic Control Valve provides temperature control., Ogontz Corp.
		Valve is available in bronze or 304 stainless steel in sizes from ½—2 in.
		Dec 7, 2004 - Control Valve conforms to ANSI B 16.34 and ASME VIII.
		Aug 19, 2004 - Diaphragm Control Valves are solenoid operated.
	news.thomasnet.com /fullstory/464559/rss/954 (734 words)

	Series 5200 Control Pinch Valve
		The valve has no packing to maintain or seats to wear, and the need for expensive body alloys is eliminated.
		The standard Series 5200 Control Pinch Valve is designed with a stroke adjustment which is located inside the valve yoke.
		The benefits of true feedback positioning on Red Valve’s Series 5200 Valves are accurate small-change response signals to the positioner, causing similar changes in true valve position, greatly enhancing control accuracy.
	www.redvalve.com /Products/Control/5200.html (311 words)

	Cooling System: Heater Control Valve (Site not responding. Last check: 2007-11-03)
		Description: A heater control valve may be located in one of the heater hoses to regulate coolant flow to the heater core.
		The valve is usually vacuum-controlled, which is operated by controls on the dash.
		If the valve has an external linkage arm, operate the heater controls and watch to see if the valve changes position.
	www.carcare.org /Cooling_System/control_valve.shtml (117 words)

	Little Giant Control Valve - 566235
		Our control and diverter valves are the solution you've been looking for.
		In addition, this valve is equipped with a quick couple connection to fountain heads 566221 and 566222.
		This control valve is intended for use in Little Giant pumps 566065 and 566095.
	www.pondsetc.com /little_giant_control_valve_566235.html (147 words)

	Control Valve, LLC - CV Corp. (Site not responding. Last check: 2007-11-03)
		Control Valve LLC, also known as CV Corp., is a leading design, manufacturer and supplier of solenoid and air actuated valves as well as the associated peripheral products such as electrical connectors, wire harnesses, mufflers, manifolds, circuits, software and hardware-controlled.
		CV products are designed to control the flow of liquids, gases and steam.
		Our product offering ranges from standard 2 way on-off valves to complete control solutions for the most demanding applications.
	www.controlvalvellc.com (111 words)

	Control Valve Handbook
		Control valves are an increasingly vital component of modern manufacturing around the world.
		This edition is a complete revision and update that includes vital information on control valve performance and the latest technologies.
		The Control Valve Handbook is both a textbook and a reference on the strongest link in the control loop: the control valve and its accessories.
	www.controlglobal.com /whitepapers/2005/48.html (273 words)

	OCV Control Valves - Global Performance. Personal Touch. - About Our Valves
		Whether you are an engineer, contractor, distributor, operator, or just an interested Internet passerby, a few minutes spent browsing through the valve components will enhance your understanding of the OCV Basic Control Valve.
		As flow control needs change and your interest moves from series to series, model to model, remember that all are but variations on this single theme -- the OCV Basic Control Valve.
		OCV Valves are hydraulically operated, diaphragm actuated for multi-function control of non-corrosive, non-abrasive fluids.
	www.controlvalves.com /about_valves.asp (162 words)

	Control Valve Signs (Site not responding. Last check: 2007-11-03)
		MS-215 control valve signs are 3" x 6" printed with fl text on white or yellow backgrounds.
		Signs affix directly to the attenuator caps of control valves using a.75" x 3" 100 mil stainless steel "L" bracket.
		Simply loosen a bolt on the valve cap, thread the bolt through the "L" bracket and reattach the bolt to the valve cap.
	www.markserv.com /doc/control.htm (165 words)

Try your search on: Qwika (all wikis)