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Topic: Relief valve

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Pressure relief valve

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	Reseat relief valve - Patent 4432389
		A relief valve with a low hysteresis closing curve with a fixed seat and a spring-biased poppet which is guided for longitudinal movement by an axial guide sleeve and aligns with its seat by pivoting about a fixed point through a small angle of rotation.
		Relief valves, from their beginning with a simple ball and spring, have had widely varying characteristics as well as problems, many of which were ignored in the past.
		To machine the parts of a relief valve with close enough tolerance to control the maximum misalignment is impractical and would cause the parts to bind, which destroys the ability of the valve to open and close at a specific pressure level.
	www.freepatentsonline.com /4432389.html (1951 words)

	Sewer relief valve - Patent 5645099
		The sewer relief valve of claim 6 wherein said flange is conformed to seal and mate with said rising walls of said raised head.
		The sewer relief valve of claim 1 wherein said float means comprises a polyethylene foam material comprising a rectangular parrallelpiped shape, wherein said float means is attached to a bottom portion of said cap means to maintain and seal said cap across said central passageway.
		Sewer relief valve 40 is necessarily manufactured of a lightweight substance, one possibility being plastic, and has the outward general appearance of standard plastic raised head plug 28.
	www.freepatentsonline.com /5645099.html (2308 words)

	Principles of Relief Valves - Fisher Regulators
		This type of relief valve may be used where venting to the atmosphere is acceptable, when the process fluid is compatible with the soft disk, and when relief pressure variations are allowable.
		These relief valves are also commonly installed with a regulator in a natural gas system farm tap, in pneumatic lines used to operate air drills, jackhammers, and other pneumatic equipment, and in many other applications.
		Relief setpoint is determined by a combination of the relief valve and regulator springs; this design generally requires significant pressure buildup to reach its maximum relief flow rate.
	www.fisherregulators.com /technical/reliefvalves (4130 words)

	Relief Valve
		The relief valve’s job is to protect the boiler against the dangers of thermal expansion.
		A modern relief valve uses a spring-loaded diaphragm to hold the valve closed.
		You should also keep the relief valve’s boiler tapping full size, and of course, make sure there are no valves between the boiler and the relief valve that could be accidentally closed.
	www.bellgossett.com /homeowners/gpart1.htm (741 words)

	pressure relief valve, axelson relief valves
		An Axelson pilot operated pressure relief valve is designed to be used on oil and gas production systems, compressor stations, gas transmission (pipeline) facilities, storage systems and in all gas processing plants; whenever there is a need to exhaust the overpressure volume of gas, vapor and/or liquid.
		Axelson pilot operated relief valves operate on the principal of unequal areas exposed to the same pressure.
		When the relief valve is closed, system pressure is pushing upwards against the piston seat seal on an area equal to the inside diameter of the seat.
	www.mckenziecorp.com /axelson_relief_valves.htm (613 words)

	Relief Valve Modeling Project
		A Relief Valve is a device, usually appended in parallel in a circuit rather than in series, used to limit the fluid pressure in a hydraulic system to a preset maximum, known as the full-flow pressure.
		The direct acting relief valve is simply a ball or a poppit and a heavy spring holding the poppit which blocks fluid flow.
		Analysis consisted of changing the number of turns on the relief valve and observing the flow rate through the relief valve and the pressure to the relief valve (experienced at the input of the actuator).
	www.me.umn.edu /courses/me4232/models/relief-valve/report.html (2115 words)

	Pressure Relief / Sustaining Valve
		It is a pilot controlled, hydraulically operated, diaphragm actuated globe valve in either the oblique (Y) or angle pattern design.
		The lower control chamber is connected through a fixed orifice to the downstream pressure, which serves to cushion the closing of the valve.
		This varies the pressure in the upper control chamber causing the main valve to throttle thus maintaining constant upstream pressure.
	www.process-controls.com /Pelmar/Bermad_730_Series.html (251 words)

	IDEX Corporation \| Micropump \| Tech Tips \| Relief Valves & Fluid Bypass
		The relief valve (also called a bypass valve) is a mechanism used to control or limit pressure by allowing the fluid to flow into an auxiliary passage, away from the main flow path.
		Generally, the relief valve is used as a safety precaution, setting a limit for the maximum operating pressure of the system or pump, ready to operate should the system exceed its pressure limits.
		Relief valves are available from several sources and typically operate on the same principle as explained previously, a poppet held in place with a spring is activated when the fluid pressure overcomes the force exerted by the spring.
	www.micropump.com /tech_tips/relief_valves.asp (799 words)

	Safety Relief Valve Products
		Valves are ideal for instrumentation panels, line blocks on cryogenic storage tanks, thermal relief or "Whistler valve" applications.
		These valves are balanced against back pressure and chatter-free, with maximum overpressure of 10% and a fixed blowdown within 20%.
		Atmospheric pressure, present at the valve inlet or outlet, depending on the application, provides the lift force required to open the main piston once the vacuum set point is reached.
	www.flowsafe.com /safetyrelief.htm (757 words)

	Relief valve set pressure (Site not responding. Last check: 2007-10-18)
		There is nothing wrong with using the MAWP of the vessel to set the relief valve.
		If we happen to be lucky enough to be able to go back to re-address the relief device specification after we get the vendor print for the vessel (which rarely happens fast enough during a plant design), we can re-specify the relief device for the true MAWP.
		We must be carful when we talk about the relief valve passing the full capacity at the allowable over pressure.
	www.cheresources.com Forums - !http: //www.cheresources.com/forums/forum5/messages/10015.shtml (401 words)

	Tyco Flow Control, Pressure Relief Valve Repair
		Upon receipt of a valve, condition assessment and repair strategies are documented on the internal job traveler/test report, which is included in the valve’s permanent record.
		Next, the valve is assembled and set to the required pressure, using the appropriate test medium, according to ASME Section I and Section VIII Div.
		Valves are shipped to the customer along with an attached copy of the job traveler/test report.
	www.tycovalves-na.com /tfcservices1.asp (143 words)

	Relief Valve Set Pressure
		Once the required relief valve orifice size is calculated, an actual orifice size equal to or greater than the calculated orifice size is chosen from a selection available from a particular manufacturer.
		The certified capacity which determines adequacy of design of a relief valve (which is the 'device' I assume you are referring to since the capacity of a stand alone rupture disk is different) is based on the criteria described in ASME Section VIII, Divison 1, Paragraph UG-131, not Paragraph UG-125.
		I see that the code states that "the valve must have the capacity to relieve the load" and that "the official rated capacity is that which is stamped" but I don't see where it says that the valve must be able to relieve the load at the official rated capacity.
	www.cheresources.com /asiseeit1.shtml (4962 words)

	Need to use Temperature Relief Valve (Site not responding. Last check: 2007-10-18)
		Is there any "rule" about the need to have a temperature Relief valve on a pressure vessel whose inlet and outlet can be closed, when there is no risk of fire and the vessel contains only a gaseous mixture.
		Relief devices (of which a relief valve is one such device) is used to protect against overpressure, not high temperature.
		It is not uncommon not to have a credible scenario even though ASME makes you put a relief valve on a given vessel.
	www.cheresources.com Forums - !http: //www.cheresources.com/forums/forum5/messages/10030.shtml (352 words)

	Series RSR Surge Relief Valve
		The Red Valve Series RSR Pressure Relief Valve is designed
		The greater the pressure build—up, the more the valve opens.
		corrosion, bridging, plugging, and valve freezing are eliminated.
	www.redvalve.com /Products/Control/RSR.html (117 words)

	Boiler Relief Valve - Heating and Air - BBS - BobVila.com
		An emergency relief valve is typically 150psi/210ºF. However, I was told to purchase a valve specifically for a boiler and use it instead.
		I know that our hot water tank's valve blows once in a while (I suspect due to heat and not pressure since I have a steam relief valve installed on it).
		I'd hate to use a standard relief valve and risk damaging the hot water coil on the HAC unit.
	www.bobvila.com /BBS/Boiler_Relief_Valve-Heating_and_Air-1-T3019.html (222 words)

	water pressure relief valve steam valve pressure relief valve
		We are a National Board and ASME certified safety relief valve assembler with over 50 years experience in safety valves.
		All of the safety relief valve listed for sale on this website carry a warranty against defects in material and workmanship under normal use and service for a period of twelve (12) months from the date of delivery to the first user.
		* The safety relief valve serves the dual purpose of relieving (1) over pressure created by thermal expansion under normal 'on and off' firing conditions and (2) over pressure in the form of water or steam created in over-firing due to failure of electrical or other controls.
	www.consumersnews.com /safety_relief_valve/water_pressure_relief_valve.html (250 words)

	Pressure Relief Valve Protection.
		Pressure Relief Valves or PRVs are indispensable to your business, but costly to maintain and highly expensive to replace.
		By combining VALVEGUARDS with your Pressure Relief Valve, you may never have to purchase expensive corrosion-resistant PRVs, or continually replace other Safety Relief Valves.
		And when your Pressure / Safety Relief Valves are operating efficiently, your entire process runs more smoothly.
	www.fike.com /valveguard_products.html (239 words)

	Water Heater Pressure Relief Valve
		If your TPR valve suddenly started leaking when it didn't use to, and you haven't had any plumbing renovation work done recently, this is the most likely cause.
		It's not uncommon for older valves to get stuck in the open position when tested for the first time after many years - so be sure to know where the water shutoff valve for the inlet to the heater is. A phone number of a plumber is a good thing to have handy.
		The backflow valve prevents this, so the extra water has no place to go and pressure builds in the tank until it exceeds the TPR valve set point (about 120 psi) and water comes out the TPR discharge tube.
	www.factsfacts.com /MyHomeRepair/PressureRelief.htm (1105 words)

	Boiler relief valve or blow off valve
		The boiler relief valve or the blow off valve is a safety valve that protects your heating system from building up to much pressure and possibly blowing up.
		A boiler relief valve needs to be tested every three months to be sure it is operating properly.
		A boiler relief or blow off valve, that has not been tested in a long time may become rusted closed, causing it to be as dangerous as not having one at all.
	masterplumber.net /boiler_relief_valve.htm (486 words)

	Mitral Valve Prolapse: Can Diet Changes Help?
		Mitral valve prolapse is a common condition occurring in approximately 4 - 18% of the population.
		Some researchers think mitral valve prolapse syndrome is a mild form of a connective tissue disorder, similar to Marfan syndrome.
		It would explain why mitral valve prolapse is commonly, but not always, linked to magnesium deficiencies, why MVP occurs as a result of rheumatic fever and why people with disorders like Down syndrome, Marfan syndrome and/or fibromyalgia often have both mitral valve prolapse and hyaluronic acid abnormalities, too.
	www.ctds.info /mvp1.html (2620 words)

	pressure relief valve liquid relief valves Kunkle valve
		Kunkle Model 330 pressure relief valve ASME Section VIII, Gas, "UV", National Board Certificate that is a lightweight aluminum construction.
		This pressure relief valve also has a full spring load is never imparted to synthetic disc insert.
		The Kunkle Model 330 pressure relief Valve are used for multi-stage high pressure compressors, intercoolers and aftercoolers, high pressure receivers and storage bottle, and for thermal expansion relief.
	www.industriesnews.com /pressure_relief_valve/pressure_relief_valve.html (188 words)

	Water Heater (Temperature/Pressure Relief Valve)
		The purpose of the TPR valve is to provide an important safety mechanism that allows for the immediate discharge of excess temperature and pressure that builds up inside the tank as the water is heated.
		While this occurrence is admittedly unlikely due to the fact that the TPR valve would have to fail (stay open) while a simultaneous drop in line pressure would create a siphon, the mechanical potential does exist for this contamination to occur.
		When you consider that the TPR valve discharges at 150 psi, which is five times greater than the force of your garden hose, the scalding water can strike the bottom of the shallow pan and spray out in all directions.
	www.myguardian.com /code/TPR/tpr.htm (1322 words)

	Automatic Relief / Bleed Valve
		In a desiccator with one relief valve, contaminants and moisture are passed from one chamber to another on their way to a single outlet at the bottom of the cabinet.
		Installation of an RB valve in each compartment ensures that contaminants are quickly purged out of the same chamber into which they entered (see application sidebar on the next page).
		The valve body is fabricated of styrene-acrylonitrile (SAN) resin that resists a wide range of process gases and chemicals.
	www.terrauniversal.com /products/desiccators/rbvalve.php (978 words)

	Waterous (Site not responding. Last check: 2007-10-18)
		The system consists of two components: the pilot valve, which is mounted to the pump panel; and the relief valve, which is mounted between the pump intake and discharge fittings.
		The relief valve directs water from the discharge of the pump back into the intake of the pump when pressure surges occur.
		Something else that you can do to help keep your relief valve and other pump systems operating well is to drain the pump and flush it with clean water once a month.
	www.waterousco.com /indexa8cf.html?module=announce&ANN_user_op=view&ANN_id=111 (591 words)

	Kalsi Engineering Valve Technology Services
		Our continuous involvement with valve technology has resulted in the development of reliable analytical models, design improvements, and innovative solutions to persistent valve/actuator problems that have defied the industry for decades.
		Analytical model predictions of the hydrodynamic torque of various butterfly valve discs (including the effect of upstream flow disturbances) were validated by scale model and full-scale valve testing.
		The CFD model was used to calculate the flow-induced torque based on the check valve disc position and flow rate, as well as the oscillation in pressure force due to flow-induced disturbances of the upstream pump.
	www.kalsi.com /valve_technology.htm (377 words)

	Home Safe Home - Safety relief valve
		Above a certain pressure, the relief valve opens to release a small amount of vapor.
		A rusty, unpainted or dark-colored tank may cause pressure build-up resulting in a safety relief valve discharge.
		Call your propane marketer whenever your relief valve pops off, so they can determine the cause.
	www.propane.tx.gov /safety/safevalve.html (97 words)

	Atmospheric Relief Valve
		EVEREST Atmospheric Relief Valves are completely dependable to relieve built up steam in cases of emergency.
		All carbon steel valves stainless steel or bronze trim to ensure smooth operation without binding or corroding in critical areas.
		During regular maintenance and as many times possible, each Atmospheric Relief Valve needs to be opened by turning the handwheel clockwise and then closing the valve by turning the handwheel counter clockwise.
	www.everestvalveusa.com /arvalve.htm (341 words)

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