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Topic: Piston valve

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	Sanitary fill tube and piston valve assembly for a pouch packaging machine - Patent 5822958
		The piston valve member is actuated by a plunger rod and is guided by a pair of arcuate guide slots formed in the spreader to accurately move the piston valve between open and closed position.
		The plunger rod and the piston valve member may include elongated internal passages therein and the piston valve member closely fits into a discharge outlet from the hollow interior of the spreader to accurately control and meter material being fed into a pouch.
		The piston valve and plunger mechanism are held in the hollow interior passageway of the fill tube and have a central opening extending through the shaft of the plunger and the piston valve to allow a compressed gas to be used to blow out any product caught in the discharge outlet.
	www.freepatentsonline.com /5822958.html (3151 words)

	Adjustable piston valve damper - Patent 5647461
		As the piston moves an additional amount of oil substantially equal to the volume of the piston rod entering or exiting the cylinder tube is forced through the piston valving or through a compression valve on the base of the cylinder tube in combination with the piston valving.
		The control valve is selectively tuned by adjusting the amount of clearance between the moving valve element and its bore wherein a designed-in clearance is utilized to provide a continuous amount of limited flow through the control valve.
		During a compression stroke of the piston assembly 19, the outer perimeter 46 of the annular valve disc 45 deflects upward off the annular rib 36 permitting flow from the flow passages 38 and 39 into the extension chamber 16 from the compression chamber 17.
	www.freepatentsonline.com /5647461.html (2421 words)

	Hydraulic piston-valve-type control valve - Patent 4739797
		Both control valves are so-called continuous or step slide valves that provide a fine controllability of the valve by providing the control edges with triangular recesses which, relative to the cross section of the control surfaces, generally have the three-dimensional shape of a half cone.
		With such piston geometries, during the opening stroke or movement of the valve piston, the control edges of the latter, beginning from the tip of the triangular recess, progressively release the control spaces or chambers disposed in the housing annularly about the piston.
		In the central or neutral position of the piston 12 in the housing 11, as effected by the centering springs 13, the connecting bores 27 and 28 are open to the tank and the pump, since the associated control spaces 23 communicate with the pertaining recesses 17 of the piston 12.
	www.freepatentsonline.com /4739797.html (2300 words)

	Checking Piston to Valve Clearance - FORDMUSCLE webmagazine
		Piston to valve clearance deals with the space between the valve and the piston during a critical point in the cam timing knows as the "overlap period".
		However when a valve reaches its maximum lift, the piston is actually the furthest away since this occurs during the intake stroke, when the piston is moving down the cylinder bore.
		Minimum clearances between the valve and piston should be 0.080" on the intake valve, and 0.100" on the exhaust valve.
	www.fordmuscle.com /fundamentals/pistontovalve (1578 words)

	Trumpets, Flugelhorns, and Saxhorns with Double-Piston Valves at the National Music Museum
		The reversed valve order was common in Bavaria until the early twentieth century, and is occasionally called "Catholic fingering," referring to the Catholic regions in which it was used.
		This double-piston valve type with short levers and flat-spring is derived from a model that originated in Saxony and was further developed in Mainz between 1830 and 1840, called the Old Mainz Model.
		Robert Eliason assumes that this valve construction with touch pieces manipulated by coil springs in a tube might be Isaac Fiske’s (1820-1894) newly improved valve design, which he exhibited at the Worcester County Mechanic’s Association in 1849.
	www.usd.edu /smm/UtleyPages/DoublePistonValves/DoublePistonValveChecklist.html (2054 words)

	Piston/valve interference problem
		The marks are not consistant between each piston, some have full eyebrows, others only have a VERY light mark at one corner of the relief...The notches in these pistons are not machined, but "as-cast".
		I thought that since it is only the intake valve making this mark, that it could not be valve float because the intake valve follows the piston downward in its stroke as it opens...
		At this time the valve is almost all the way open and the piston is at it's upper most travel.
	www.hotrodders.com /forum/piston-valve-interference-problem-53253.html (1154 words)

	Checking Piston to Valve Clearance
		Piston to valve contact is probably one of the most common causes of damage to a racing engine.
		Anytime you make a change to your engine in relation to the cam lift, cam timing, pistons, cylinder heads, rockers arms, or anything else that can change, even so slightly, the position of the valve in relation to the piston, you MUST verify that you have the minimum clearances safely met.
		In applications where you have contact, the most common are in the piston valve reliefs (eyebrows).
	www.centuryperformance.com /piston2valve.asp (0 words)

	Parts for MD-EN130 and Honda small engine parts
		Ref# 7 in Valve, Rocker & Camshaft assy diagram - TAPPET
		Ref# 16 in Valve, Rocker & Camshaft assy diagram - INTAKE VALVE
		Ref# 17 in Valve, Rocker & Camshaft assy diagram - EXHAUST VALVE
	www.m-and-d.com /MD-EN130_Parts.html (675 words)

	Piston valve - SpudFiles Wiki
		The pilot valve (D) behind the piston is opened, the pressure in the pilot volume (C) drops, and the higher pressure in the chamber area pushes the piston away from the barrel.
		The piston of a chamber-sealing piston valve has to seal on both the chamber port and to the pilot volume.
		The pilot valve (D) behind the piston is opened, the pressure in the pilot volume (C) drops, and the higher pressure in the chamber area pushes the piston away from the chamber.
	www.spudfiles.com /spud_wiki/index.php?title=Piston_valve (707 words)

	Cleaning a piston valve instrument
		Valve action in particular is drastically effected when those aerosols attach themselves to the piston and valve casing.
		To clean the valve casings you should use a valve casing brush that is soft enough to avoid marring the casing wall.
		It is very important that the pistons, the valve casings, and the ends of the slides be bone-dry before you begin to reassemble the instrument.
	abel.hive.no /trumpet/tpin/cleaning.html (1200 words)

	Controllable piston valve and /or flat valve for a vibration damper patent invention
		In one-tube absorbers a valve arrangement is provided in the piston of the piston cylinder structure which restricts the fluid in both directions of its throughflow passage, and in the piston chamber a separate storage volume is located which is compressed in the pressure cycle of the shock absorber.
		A bottom valve is also used in a damping member in a plunger cylinder arrangement wherein the damping medium in the compression cycle is pressed into an external storage through a bottom valve while in the pulling cycle the medium flows back from the external storage into the plunger chamber through the bottom valve.
		Finally it is conceivable with two-tube shock absorbers to design the piston valve and the bottom valve in a manner according to the invention for the compression and the pulling cycle as well and to divide the damping effect for both directions on both valves.
	www.freshpatents.com /Controllable-piston-valve-and--or-flat-valve-for-a-vibration-damper-dt20060810ptan20060175166.php (2275 words)

	Performance Unlimited 4-Wheel & Off Road Center - Hartford, Wisconsin - USA
		The valve train of an internal combustion engine is one of the most fragile components in the system, but when they are pushed beyond their mechanical limitations, the destruction that can result is phenomenal.
		This particular failure was caused by floating a valve, resulting from exceeding the rpm limitation of the valve train, thus tapping the piston against the valve at ultra-high speeds.
		If the Intake valve fails, the open port allows the shattered debris to be sucked backed into the intake manifold from the suction of the other cylinders, and this process is repeated hundreds of times a second.
	performanceunlimited.com /illustrations/pistonfailures.html (787 words)

	NRHS - High Performance for your Harley Twin Cam, Evolution, Sportster or Buell!
		Piston to valve clearance is a critical dimension, as not enough clearance here can cause bent or even broken valves.
		A quick and dirty method for checking valve to piston clearance is to attach a Trock fixture or similar to the cylinder head, and with the engine positioned at TDC, open each valve until contact just occurs, measure how much lift it took, and subtract the TDC lift figure.
		Since the valves and the pistons are both moving in the real operation of the motor, the point where they're closest together is not necessarily right at TDC.
	www.nrhsperformance.com /tech_valvetopiston.shtml (1958 words)

	Piston valve - MarchingWiki (Site not responding. Last check: )
		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.
		Cylindrical piston valves are used to change the pitch in the playing of many brass instruments.
		When a piston valve is opened ("pressed" and "pushed down"), each valve changes the pitch by diverting the air stream through additional tubing, thus lengthening the instrument and lowering the harmonic series on which the instrument is vibrating.
	www.marchingwiki.com /wiki/index.php?title=Piston_valve (463 words)

	Early Valve Designs
		For example, the bore of the instrument, disrupted at the 90-degree bend in the windway at the bottom of the valve casing, was then further disrupted in the middle air passage of the valve.
		It is a piston valve design, derived from the box valve, which shared the acoustical advantages of the box valve but was much easier to construct and maintain.
		Although rotary valves are difficult to disassemble for maintenance, this type of valve was to become the standard design used on horns in Germany by the late nineteenth century [Carse, ibid].
	www.public.asu.edu /~jqerics/earlval.htm (1249 words)

	Cheap Musical Instruments
		Because your piston valve instrument is a precision piece of equipment, proper care and maintenance should become a regular routine before and after playing.
		Apply valve oil sparingly (1 to 2 drops) to each valve piston, use your finger to spread the oil over the valve piston, remove any excess oil from the valve and return the valve to its casing.
		After the valve is replaced, if it is difficult to blow through the horn or if the valve does not move freely, your probably have the valve in backwards.
	www.cheapmusicalinstruments.com /piston.asp (680 words)

	MusiChem, Inc.
		Valve oils for piston valves fall into 3 groups: Type 1 are the low technology formulations based on a modern day version of kerosene (the odor is quite obvious); Type 2 are high viscosity oils; and Type 3 are light weight oils with little or no petroleum odor.
		The primary purpose of valve oil is to provide a thin film of slippery fluid which clings to the valve and casing, thereby acting as a barrier to prevent direct metal to metal contact between these critical surfaces.
		Water trapped in the valve chamber experiences the shear force of the piston moving rapidly past the walls of the valve casing.
	www.musichem.com /articles/p_oil_e.htm (1970 words)

	Piston to Valve Clearance
		While the Drop Valve method can indicate static clearance between the head of your valve and the top of the piston, it cannot indicate proper clearance between the edge of the valve head and the side of your valve relief in the piston top (if valve reliefs are present).
		The thickness of the clay is the valve clearance to the piston.
		Before removing valve springs from mounted heads, be sure that the piston is at TDC on the exhaust/intake stroke to prevent the valves from possibly falling into the cylinder.
	www.diyporting.com /PVC.html (1768 words)

	Superheaters, Slide Valves, and Piston Valves
		The ports of piston valves were around the entire circumference of the valve, and weren't limited by a flat space.
		It was quickly found that slide valves didn't work with superheaters because the lubricants of the day couldn't protect such a great flat sliding valve under pressure (the steam pressure acted upon the valve even with balancing strips) at the superheated temperatures and valve seats were quickly worn and/or scored.
		The cylinders rarely wore out; the pistons and valves didn't wear on the cylinder casting itself; there was a cylinder liner pressed into the cavity which was machined out to the proper inside diameter for the piston to run in, with its packing rings.
	www.nwhs.org /qna/slide_vs_piston.html (1559 words)

	Piston Valves - Bonetti Valves
		The piston valves are unique in that they do not have a metal to metal seat.
		Piston valves are API 6FA fire safe, provide very low fugitive emissions, and can be used in dirty fluid handling applications, and in particular, where there is poor quality steam with a potential for flashing and cavitation.
		Piston valves are available as stop valves, or for throttling flow control service.
	www.bonetti-valves.com /piston.htm (155 words)

	Security Clearance: Measuring Piston-To-Valve Clearance The Right Way National Dragster - Find Articles
		After establishing that the valves have enough radial clearance and that the angle of the reliefs are correct, you are finally ready to check piston-tovalve clearance.
		Compress the spring on the exhaust valve and measure the movement required for the valve to contact the piston.
		Piston manufacturers can't anticipate every possible combination of heads, cams, block height, valve height, gasket thickness, and the like, so shelf-stock pistons are typically machined with enough clearance for the worst-case scenario.
	www.findarticles.com /p/articles/mi_qa4078/is_200403/ai_n9406663 (864 words)

	Security Clearance: Measuring Piston-To-Valve Clearance The Right Way National Dragster - Find Articles
		After establishing that the valves have enough radial clearance and that the angle of the reliefs are correct, you are finally ready to check piston-tovalve clearance.
		Compress the spring on the exhaust valve and measure the movement required for the valve to contact the piston.
		Piston manufacturers can't anticipate every possible combination of heads, cams, block height, valve height, gasket thickness, and the like, so shelf-stock pistons are typically machined with enough clearance for the worst-case scenario.
	findarticles.com /p/articles/mi_qa4078/is_200403/ai_n9406663 (864 words)

	Klinger Valves
		In 1922, Richard Klinger invented the piston valve by replacing the disk and seat of a conventional globe valve with a cylindrical piston and two resilient, replaceable sealing rings.
		When closing the valve, the piston pushes and wipes away any impurities, which might be present in the fluid, ahead of itself.
		The double guidance of the piston in the closed position prevents fluttering and vibration in the throttled position and is better able to handle turbulence in the pipeline.
	www.thraco.com /Klinger/Info.htm (305 words)

	Woodland Engineers
		Here the bottom ring of the valve serves the purpose of the seat while the upper ring serves the purpose of a gland.
		The advantage of the valve is when any leakage is observed from the hole of the bonnet, specially provided for this purpose, it can be stopped on the line.
		The maximum thickness of the ring is utilized and when the valve cannot be further tightened to stop the leakage, It is only required to replace the sealing rings.
	www.woodlandengineers.com /piston_valve.htm (431 words)

	Ross Valve
		All Ross Valves operate with the same basic hydraulic principles and are composed of two essential parts: the main valve (through which the main flow of water passes), and the externally piped control device.
		These pistons ride along the axis in replaceable cylinders to act as guides to absorb and counteract the lateral thrust generated by the flow through the valve.
		If operating conditions drastically change (if a valve is moved to a different location or required for a different application), other style seat skirts are interchangeable with the original.
	www.rossvalve.com /vconstruction.htm (419 words)

	Care and Maintenance of your piston valve instrument
		Make it part of your regular routine Because your piston valve instrument is a precision piece of equipment, proper care and maintenance should become a regular routine before and after playing.
		Clean the Valves Clean the valves and valve casings frequently when the instrument is new.
		Valve Oil Apply valve oil freely (3 to 4 drops) to each valve piston and return to its casing.
	www.chrisbsmusic.com /carandmainof1.html (426 words)

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