API Cast Steel Check Valve 500 mm in Accordance with ISO17292、API 608、BS 5351、GB/T 12237

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Product Description:

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.                                                                                                         

Body-To-Bonnet Joint

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.

Standard Criteria

 ASME/ANSI/API customize   

Pressure Rating

 150   Class  300 Class  600 Class  900   Class  1500 Class  2500 Class customize 

Valve Size

 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 


 Automatic customize 


 Butt Welding  Flange   RF  Flange RTJ customize 

1-Body Material

 A216   WCB  A351-CF8  A351-CF8M customize 

2-Seat ring

 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 

6-Arm pin

 A182-F316  A182-F6a  A182-F304 customize   


 A351-CF8M  A216   WCB  A351-CF8 customize 

8-Bonnet nut

 A194 2H  A194   8M  A194-8 customize 

9-Bonnet bolt

 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 

13-Eye bolt

 A181 customize 

Design Standard

 API 6D  BS   1868 customize 

Connection Standard

 API 605  ASME B   16.25-2007  ASME B 16.47A  ASME B 16.47B  ASME   B 16.5  MSS SP-44 customize 

Test Standard

 API 598  API   6D customize 

Face to Face

 ASME B 16.10 customize 

Pressure-temperature ratings

 ASME B   16.34-2004 customize 

Wall thickness dimension

 API 600  BS   1868 customize 

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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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