The features of check valve
Bolted Bonnet;Swing and lift disc;Metallic seating surfaces.
Body and Bonnet Connection
The body and bonnet of Class150~Class900 check valves are usually with studs and nuts.And the body and bonnet of Class1500~Class2500 check valves are usually of pressurized seal design.
Stainless steel + flesible graphite wounded gasket is used for Class 150 and Class 300 check valve;Stainless steel + flexible graphite wounded gasket is used for Class 600 check valve,and joint gasket is also optional for Class 600 check valve;Ring joint gasket is used for Class900 check valve;Pressurized seal design is used for Class 1500~Class 2500 check valves.
For carbon steel check valve,the seat is usually forged steel.The sealing surface of the seat is spray welded with hard alloy specified by the customer.Renewable threaded seat is used for NPS<10 check valves ,and welded on seat can be also optional if being requested by the customer.Welded on seat is used for NPS>12 crbon steel gate valves .Forstainless steel check valve,integral seat is usually adopted ,or to weld hard alloy directly integrally.Threaded or welded on seat is also optional for stainless steel check valve if being requested by the customer.
150 Class 300 Class 600 Class 900 Class 1500 Class 2500 Class customize
50 mm 65 mm 80 mm 100 mm 125 mm 150 mm 200 mm 250 mm 300 mm 350 mm 400 mm 450 mm 500 mm 600 mm 650 mm 700 mm 750 mm
2 inch 2.5 inch 3 inch 4 inch 5 inch 6 inch 8 inch 10 inch 12 inch 14 inch 16 inch 18 inch 20 inch 24 inch 26 inch 28 inch 30 inch customize
Butt Welding Flange RF Flange RTJ customize
A216 WCB A351-CF8 A351-CF8M customize
A105+13Cr A351-CF8M A351-CF8 A105+Tool Steel customize
13Cr+A216 WCB A351-CF8 A351-CF8M Tool Steel+A216 WCB customize
A351-CF8M A216 WCB A351-CF8 customize
A194-8 A194 2H A194 8M customize
A182-F316 A182-F6a A182-F304 customize
A351-CF8M A216 WCB A351-CF8 customize
A194 2H A194 8M A194-8 customize
A193-B8 A193-B8M A193-B7 customize
A193-B8 A193-B7 A193-B8M customize
graphite+304 316+graphite customize
A351-CF8 A216 WCB A351-CF8M customize
API 6D BS 1868 customize
API 605 ASME B 16.25-2007 ASME B 16.47A ASME B 16.47B ASME B 16.5 MSS SP-44 customize
API 598 API 6D customize
Face to Face
ASME B 16.10 customize
ASME B 16.34-2004 customize
Wall thickness dimension
API 600 BS 1868 customize
- Q:How do I replace my Washer Mixing Inlet Valve?
- Buy a new valve at an appliance parts outlet. Make sure it's the right one. Many times they will come with instructions. Unplug the unit. Shut off the water and remove the hoses. Remove the back panel to access the valve. Remove the old broke valve and replace it with the new one. Replace the panel. Attach the hoses and turn on the water. Check for leaks. Plug in the unit and give it a test. Try all the temperature settings. Congratulations. You are now a professional..
- Q:Why does plumbing code require a gate valve for the main shutoff?
- I agree with Ed. I have had far more problems with gate valves than ball valves. They can break in either the on or off position which can really be inconvenient. They usually break on me in the off position after performing minor plumbing repairs.I will often use the main shut off at the street if I see an old gate valve. If you are required to use a gate by local codes (I don't know your codes but here in California a ball valve is fine) put the ball valve after it and use it for your shut off.
- Q:how to loosen a ball valve?
- If what you have is a KBI plastic valve used commonly in PVC water pipe systems, you are stuck with a stiff valve. The best and only medicine for them is to open and close them frequently. Hard water deposits will cause them to work harder as well. If, and when you replace, useing a little petroleum jelly on the ball portion before installation might help, but I’m sure the manufacturer would frown on this. They can operate so hard that the handle will break off, so if you can turn it on and off, just keep working it.
- Q:EGR valve issues?
- Get out your jumper leads and backprobe the egr solinoid. ok. 1st thing......attempt to kill the motor at idle using the egr solinoid. apply ground to the proper wire(not red) and see if the egr valve operates, killing the motor idle. if it does operate, but doesn't kill the motor......you have some cleaning to do. if it operates, and kills the motor.......the valve and solinoid are ok. (the solinoid should also vent the egr valve vacuum when de-energized) Now.....for the tricky part. AFTERMARKET EVP SENSORS SELDOM READ CORRECTLY. 1. Turn the key on and check the voltages at the Exhaust Gas Recirculation (EGR) Valve Position (EVP) Sensor. The Brown/White (BN/W) should be 5v, the Grey/Red (GY/R) is ground and must read 0.1v or less at all times. The Brown/Green (BN/GN) is the signal and MUST read 0.40v to 0.45v. If it does not, the vertical position of the sensor must be changed BY ANY MEANS NESSESARY. a NEW valve will sit higher than an old one......but sometimes not. There are things you can try to lengthen the shaft to increase the voltage reading, such as heat shrink tubing. This EVP issue is an annoying one (even for experienced mechanics), but has little effect on gas milage, unless it is TRULY stuck open. If it were stuck open.....the truck would be running very rough at idle or die.
- Q:What would be the effect on valve opening if the clearance was set too large or too small?
- We have to assume the camshaft is the standard one that came from the factory. #1. If the valve clearance between the rocker arm and end of the valve stem is set too close you risk burning the exhaust valves. As the coolant travels through the cylinder head it cools the valve seats. The valve seats cool the valves. If the valve clearance between the rocker arms and valves are too loose damage may result to the end of the valve and rocker arm. You'll also loose cam duration and valve lift.
- Q:Noisy Xr250r motor, valves.?
- .004 is a bit tight for an exhaust valve? usually this is nearer 10 thou. It is better to have slightly larger clearances to the tappets/ valves than to be too tight and risk burning your valves. You do not mention the decompressor! I'm sure your bike should have a manual decompression lever if not an auto retard unit on the cam shaft to allow you to atleast crank the engine up to TDC on the compression stroke. I suspect that is where the noise problem is coming from, either that or you might be one tooth out on your cam shaft gear allowing the piston crown to kiss the valve when it is open...hence explaining the very hard to turn over!! but see my other comment too! What ever It is time to remove the inspection covers and re examine the whole set up. BTW the bike should be an UTTER PIG to kick over compression without a decompressor!! as it has a very high compresion ratio. expect to be standing up on the kick start if you are less than 160 lb (11 stone) 78 kg
- Q:Damaged water valves will not close?
- Just shut the water off to the house and then you can change the faucet without having to mess with the valves. If you want to shut off the valves though just use a pair of chanel locks to turn them once you break them loose they will turn easier. If the handle breaks off it no biggy, it wont hurt the valve any, you just wont have handles but they dont work anyways right.
- Q:Shielded core solenoid valves?
- In practice, engineers do not use solenoid valves directly on chemical or process lines. They are bound to leak and cause danger particularly in your case of 98% sulphuric acid. Use a mechanical valve actuated by a motor (since cost is no issue to you) If an air supply is available, then you can use pneumatic diaphragm valve operated by a solenoid valve. Motorised valve has slower fixed open close time VS faster adjustable open close time for air operated valves.
- Q:About the shut off valve?
- You have the main water line outside that feeds everyone. Look for a man hole cover and remove it. You should see the turn off valve there. There may be a pipe unit that the county removed so the water could not be turned back on. Call the country and ask for the water to be turned back on. If you are talking about the line after it goes onto your property then it's just a large pipe that comes into your home somewhere. They normally put a on/off valve at that point that allows you to shut the water off inside the home. If the pipe inside the house is detached from that valve then someone most likely cut it and took out a section. You would have to turn the water out at the manhole so you can open that valve and drain the water out of it. Then using a torch/solder/pipe sleeves, new pipe etc solder the replacement piece in place. Remember water in a pipe will not allow the pipe to reach soldering temp without creating steam, which can burn you. Hope that helps....
- Q:Flap valve replacement?
- Its heart surgery, which is riskier than many other surgeries, but valve replacement is routine procedure. There's a variety of different procedures that are used and several different types of replacement valves. Some valves can be repaired and some need to be replaced. Repairs usually give a person a normal or nearly normal valve that will last forever. Valve replacements don't work quite as wells as repairs and they usually need to be replaced in a decade or so. Most people can have the valved replaced by threading a scope through the arteries or using tiny incisions, but some people require open heart surgery. My friend had one of his valves replaced with a valve made from a pig heart and he was only in the hospital one night, and back to work a week later.
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