Pressure Reducing Valves

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A pressure relief valve (PRV) is a safety device that relieves overpressure in a vessel or system. When the pressure of vessel or system increased beyond the specified design pressure or maximum allowable working pressure, PRV will be opened automaticly to relief the overpressure for proteding the vessel or system. The PRV will be closed if the pressure reached specified design pressure so that to ensure the normal operation and protect the vessel or system.

Our Pressure Relief Valve has been designed and manuractured according to following Standard:

♦ ISO 4123-1 Safety Devices for Portection Against Excessve Pressure
♦ API STD 526 Flanged Steel Pressure Relief Valves
♦ API STD 527 Seat Tightness of Pressure Relief Valves

♦ ASME Boiler and Pressure Vessel Code Section VIII Division 1, Rules for Construction of Pressure Vessels

♦ Type: Conventional, Bellows

♦ Size:1" D 2"- 8" T 10"
♦ Class:150lb~2500lb
♦ Temperature:-268~+538°C

♦ Fluid: Gas, Steam, and Liquid
♦ Material: Carbon steel, Stainless steel, Alloy steel
♦ The allowable tolerance of the set pressure: ≤±3%
♦ Overpressure: ≤10%(gas)/≤20%(liquid)
♦ Blowdown: ≤10%(gas)/≤20%(liquid)

♦ Tightness: conforms to API STD 527


♦The solid nozzle is screwed into the body, which makes the maintenance easy.
♦ The shape of the disc holder has been designed to enhance the effect of the fluid thrust for an instant lift of the disc.
♦ Blowdown control is provided with adjustable nuzzle ring only.
♦ The adequate terials and clearance between disc holder and guide , spindle and adjusting screw assures disc to lift successfully.

♦ The surface of both the disc and the nozzle seat are deposited with Stellite. Excellent flatness and surface finish of the seating surfaces by precision machining and lapping assure pressure relief valve to have high degree of seat tightness and long using life.

♦ The bellows of balanced bellows pressure relief valves can not only avoid and effect of variable back pressure in the system , but also protect spring and other trim components from corrosive media.

♦ Materials are chosen carefully , and the manufacture of the spring and the bellows has strict technological process. Each of them is tested and checked strictly.

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Q:valve gasket nissan altima?
The part itself is less than $100. It's a little rubber gasket that goes inbetween the valve cover and the engine block to make a tight seal between the middle and top of the engine. Depending on which engine you have (the 4 or the V-6), it can be a VERY simple fix with about an hour's labor because the valve cover is on top. However, some (very few) cars require you to remove the motor to get to the cover. If this is the case, 7 hours seems about right.
Q:Dangers of mitral valve prolapse?
There are many people with mitral valve prolapse that never have symptoms related to it and never have any problems as a result. Mitral valve prolapse can lead to the backflow of blood through the mitral valve known as mitral regurgitation. This can potentially lead to abnormal heart rhythms, such as atrial fibrillation. The concern with skydiving is that it would lead to a surge of adrenaline resulting in increased heart rate, strength of heart contractions and overall workload of the heart. If you have MVP without regurgitation, then your risk would be similar to the general population. If you have regurgitation it depends on the severity the regurgitation. If you have mild regurgitation, then it also should not be a problem. If you have severe regurgitation, then you could run into problems from the increased workload of the heart. In this case, I would suggest you discuss it with your Cardiologist. It is unlikely that you have atrial fibrillation. If you by chance do, then it depends on how well your heart rate is controlled. If there is any doubt, then ask your Cardiologist. Good luck.
Q:Volvo 850 blue smoke exhaust. Most likley Valve seals? or valve guides..or something with the valves.?
a valve guide is basically a round tube that is press fit ito the cylinder head, the stem of the valve rides up and down inside this sleeve as the valve opens and closes. the stem seal fits on the spring end of the valve guide and seals against the valve stem keeping oil out of the guide [and running down the stem and getting into the combustion area when the valve opens] valve stem diameter and guide bore dimensions are close fitting but the stem is always smaller than the bore [very little oil is available to lubricate this area under normal circumstances] so both the guide and stem can wear [the guide is of a much softer material than the valve so it does most of the wearing] high mileage engines can have very egg shaped guide bores allowing stem movement which if not corrected will ruin a new set of stem seals in short order i hope that i have been clear on this but if you have more questions please ask,as there are several very knowledgeable people who answer volvo questions at this site. NOTE: the valve seat is concentric with the valve guide bore. due to machineing tolerances when the guide is replaced the valve seat will no longer be concentric with the new bore and the valve will not seal properly so the seats will have to be re-machined off of the new guide and then the valve faces will have to be machined to the proper fresh sealing angle of the new seat [hence a complete valve job as far as costs go if memory serves this job pays approx 9 hrs. labor,.plus machine shop work.[generallywith new guides seals resurfacing and a pressure test and cleaning about 400+ or- and related gaskets seals fluids timing componants i suspect the final bill may be above 2 grand but if you kept up with oil changes and the bottom end is't hurt your car is well worth this expense
Q:emission control valve?
emissions control valve is another name given for an exhaust gas recirculator valve(egr valve). This valve routes a sample of your cars exhaust gases back into the cylinder to be re-burned and therefore lowers emissions.The ports to this valve become clogged over time and can create performance issues
Q:Tough question about valves?
The flow coefficient is a measurement usually given for a valve fully open, identified in the specs as the Cv. It basically tells you how much flow you'll get through the valve for a given pressure differential across it, or conversely how much your pressure will drop if you force a certain volume through it. Some valve types are effectively orifices (gate valves) or short lengths of pipe (non-full-port ball valves), others like solenoid types have more complicated internal paths the reduce flow because of the fluid having to change directions in addition to squeezing through orifices.
Q:What are these valves on top of my compressor?
They are the unloader valves. Look online for places that sell parts for air compressors.
Q:What causes valves to leak?
The leak is called regurgitation or prolapse .. Here is a little example. Hold up your hands and put your index fingers tip to tip .. like they are pointing at each other. These two fingers will represent the valve's 'leaflets.' Operating normally, your 'leaflets' will open and close together, like a trap door. Now, within your heart's chambers, blood is supposed to flow in only one direction. It is the valve's job to ensure that blood only goes in one direction in each chamber. There are four valves .. tricuspid, pulmonic, mitral and aortic, and four chambers. In a normal valve, the sides open and close in unison with the help of regulating 'cords' that work much like a parachute's cords. If these 'cords' weaken, the valve will leak. Much like a bodybuilder that stops working out and gets flabby, these cords can get 'flabby,' (stretch) and become unable to operate the heart's valve efficiently. Sometimes, the leaflets thicken as a result of infection like rheumatic fever or endocarditis. The thickening will prevent the leaflets from closing tightly (... imagine them being slightly weighted... ) and blood will flow backwards through the valve. Aging, previous heart attacks and congenital birth defects are also common causes of heart valve disorders.
Q:Which is the intake and which is the exhaust valve?
the intake valve is usually bigger and on the left. the exhaust valve is usually smaller and on the right. at least it is true in small engines (lawnmowers).
Q:how can I buy a useful ball valve??
Hi here in the united kingdom the only place you would find a ball valve is in a tank like a header tank in the loft or in a toilet. then it would be a low pressure one or a high pressure one. what you have described sounds more like a stopcock which is a tap to switch off the main water supply to the property. which you should consult the water company about as it maybe there responsibility. so i would consult with them first.
Q:What is poppet valves?
Poppet valve is the commonly used term for a standard, mushroom- shaped engine valve.Obviously, the mushroom head is part of the valve, so yes, it does move up and down with its stem.

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