Full Welded Forged Steel Ball Valve DN 18 inch

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Design Features of full welded forged steel ball valve

The body of ball valve is full welded,selects high quality forged material,and adopts the advanced forged forming technology to form two semi-spheres which are welded into a whole in the middle of the body.This welding technology differentiates the ball valve form others,and makes the valve more spherically,so the valve structure is more compacter,lighter and stronger.Besides,the middle direct welding realize highly accurate valve body manufacturing,makes fully and completely sealing between the seat and ball.The full welding instead of bolts completely avoids the outside leakage,so ball valve is the ideal product for under-ground,offshore working platform and under-sea equipments.

Adopting fixed plates or trunnion to support the ball

The top and bottom of the ball is supported by upper and lower fixed plates or stem and trunnion,and the ball is accurately placed in the center of the ball valve to achieve complete seals and precise movements.When plate adopted,the force exerted by the medium to the ball is distributed via the plate to the left and right bodies,so that the stem does not bear the blending moment from the medium,but only the torque from the ball rotation during the opening/closing of the valve.The low-friction PTFE Teflon composite bearings installed between the ball axis and fixed plate and between the stem and the trunnion can absorb ball moving action caused by the pressure of the medium.This structure brings stable actions and easy operations for the ball valves,and the required operation torque can be reduced,so smaller actuators can be used,and the cost is cut down.

ball valve seat is floating structure,means the seat can move along the medium direction,so that the seat can fit against the ball all the time.
Double piston effect structure seat of full welded forged steel ball valve
Seat design is special double pistons effect structure,it can ensure the seal wherever the medium flows into the ball valve.

Seat multistage seal strucute of full welded forged steel ball valve
As following graphic instruction,on seat bearing ring,set two soft sealing rings(A and B)and metal sealing spherical surface which can seal with the ball.Seat ring A is spring loaded,which seals the surface with the ball tightly to the surface to form an initial seat;When there is pressure generated from medium,the piston force is generated to make seal ring A elastically deformed and seal ring B fit the surface of the ball surface due to the piston effect caused by area difference,thus the second seal forms.When the medium pressure is rising.It will generate huge pressure to seal ring A and seal ring B,so the two seals have a greater elastic deformation,then metal seal ball surface compact with ball surface to form the third level of metal to metal seal.

Secondary seat seal device of full welded forged steel ball valve
As the above graphic instruction,the secondary seal device(seat grease injection valve)can be chosen according to the actual working condition,medium requirement,seal requirement,etc.Seat ring grease injection valve is a one-way valve,installed on the body,which can prevent the leakage and inject grease under the outside force.When secondary seal is required,there is a grease injecting channel and hole on the seat ring.The grease can form a seal between the seat and the ball,and then stop the leakage.

Standards Applied of full welded forged steel ball valve

Design   Standard

 API   6D customize 

Connection   Standard

 ASME   B 16.25-2007  ASME B 16.5  ASME B 31.4  ASME B   31.8  DIN  GBGB/T  JBJB/T JIS customize   

Test   Standard

 API   6D customize 

Face   to Face

 API   6D customize 

Pressure-teperature   rating

 ASME   B 16.34-2004 customize 


 MSS   SP-25 customize 

FAQ of full welded forged steel ball valve:

Q1:I can’t find the type of steel check valve which I need. what can I do?

The chart above only lists out some common composition of steel check valve parts.We may provide other different parts material composition according to the customer's request or the actual valve working condition.


Q2:Which certification do your products pass?

  Our products are in accordance with ISO 9001ISO 14001API 6AAPI 6DTS CEAPI607/6FA/BS6755.


Q3:How can I place an order?

  The only one thing you should do is to tell us the sepecification about type quantity and  mode of transportation, then we will send you quotation within 24 hours.

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Q:Location of an EGR Valve?
Ok here we go First raise the hood the engine sits side ways. now on the Passenger side of the Engine compartment is the engine. (i'm serious here) the end with the belt and the pulleys wil /and is Called the front even thou it sits sideways. now the thing on top of the engine is called a valve cover start looking from the front and follow it to the back (that's toward the Drivers side) when you get to the end of the valve cover look down you will see a Valve about 2 inches below the valve cover it has a black Vacuam line that runs to it this is the EGR valve. now Why in the world do you want to make it open on a 1992 Cavalier. most of the time we replaced them because they stuck open and caused idle problems. if your trying to just keep the light out Good luck
Q:Does any one knows were i could buy a VALVE COVER for a 1999 mazda miata?
mazda dealer or find one in the junk yard.
Q:Faulty pcv valve on mazda 626 (1999) European?
might so easy and cheap to replace
Q:pressure release valve?
Yep...pcv valve. Couldn't really tell you where it is on a zetec but there should definitely be a haynes for your car (check your local library). Otherwise, other things (NOT RECOMMENDED!) you can do is release the crank/head pressure by drilling a hole through your oil cap threading a fitting on there and attaching a breather filter. It won't look good but it will work if you can't get to the valve. But you'll have to replace the oil cap once you actually fix the problem.
Q:Mayo Clinic in Rochester Minnesota and Mitral Valve Prolapse?
was this diagnosis made by a cardiologist? You said your doctor - are you referring to your primary MD. I am going to assume the MVP diagnosis was made by a cardiologist . the referral to the hospital - is this to a cardiac surgery program at the hospital. You may definitely want to get a second cardiology opinion. Do you live near the Mayo clinic? You also have to consider your health care insurance and what they will cover. It sounds as if your MD is sending you in the appropriate direction - to a hospital - to look at treatments. Can you call this hospital to find out more about the services to which you are being referred?
Q:Question about valve cover gasket?
I would tighten them a little. Hope you cleaned the valve cover and head good before you installed the gaskets.
Q:do i need a pressure reducing valve?
My okorder.com/
Q:Why do Presta valves exist?
See okorder.com/
Q:Warped valves on my car? ?
who told you that? valves don,t warp. valves can bend and carbon up so much they won,t seat but they don,t warp. pull the heads and have new valves put in or have your valves ground and seated. a good machine shop can do that for you.
Q:valves adjustment in 6 cylinder in line mercury marine?
There are 2 different ways, with the engine warm remove the valve cover start the engine and 1 at a time back the adjuster nut off till the lifter starts to click and tighten it 3/4 of a turn going 1/4 turn at a time this is very mussy with oil all over everything. The easiest way is to turn the engine to number 1 TDC and back off the adjusters till you can just turn the push rods with your fingers and then retighten 3/4 turn do this in the following order #1 E+ IN #2 - IN #3 E #4 - IN #5 - E--- then turn the engine 1 turn to number 6 TDC and adjust the remaining valves the same as the first in this order # 2 - E # 3 - IN #4 - E #5 - IN # 6 IN+ E Then reinstall the valve cover and your done much cleaner way

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