Full Welded Forged Steel Ball Valve DN 8 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:What are the brass instruments with valves?
Trumpet, cornet, tuba, baritone, alto horn, mellophone, mellophonium, Flugelhorn, valve trombone, french horn, Rein horn, Helicon, Wagner Tuba, descant horn, piccolo trumpet, alto trumpet, bass trumpet, some hunting horns (cor chasse), keyed bugles, ophioclide,unihorner, frumpet. and all those drum and bugle corp instruments. I have listed maybe 1/10 of the instruments that have come up over the years with valves.
Q:***10 points**** Which set of valves closes when the ventricles contract and relax?
There are two types of valves in the heart: the atrio-ventricular (AV) valves and the semi-lunar valves. There are two AV valves: the tricuspid between the right atrium and the right ventricle, and the mitral (also called bicuspid) between the left atrium and the left ventricle. There are also two semi-lunar valves: the pulmonic semi-lunar, between the right ventricle and the pulmonary trunk (artery) and the aortic semi-lunar, between the left ventricle and the aorta. During diastole (the relaxation phase), the AV valves are open and the semi-lunar valves are closed, so the ventricles can fill with blood. During systole (the contraction phase), the AV valves close and the semi-lunar valves open so the blood can be pumped around the body.
Q:Globe Valve - Industrial Application?
I will rstrict myself to only the types other wise the selection criteria are many. GLOBE: These are used for controlling a process parameter loop. They cause medium pr. drop are ideal for clean fluids. The shape of the stem is contoured to get the desired characteristics. The repeatability of the type in flow control make it ideal for closed loop control. BUTTERFLY: These are low pr drop devise that are used primarily where u can't allow higher pressure drops. Good for clean fluids in on/off service. Even allowed for gases. it opens/shuts faster than other types of valves. Sealing characteristics are not as good as ball valve, particularly unsuitable for fluids containing solids.
Q:stop intake valve leakage in auto?
I think your confused. The intake valve lets fuel and air into the combustion chamber, there is no antifreeze held in by the intake valve. If you have an antifreeze leak that is visible on the outside of the engine, you can trace the leak to the source of he leak and repair it. If you are not mechanically inclined, I would take the vehicles to a reliable shop. ASE Master Tech 30 + yrs. Retired.
Q:How to drill hole through pipe for saddle valve?
This requires a water hook up kit. They're rather cheap - 20 to 30 dollars. For a distance such as yours, it's best to run the flex line from behind the fridge, down through a small drilled hole in the floor next to the wall, and under the floor. And along the basement ceiling, securing it to the floor joists in the basement ceiling, or drilling holes in the joists - as with running electrical wire. If the joists are laid in the same direction the hose needs to go, then it is simply secured in place with plastic loops against the side of one joist. When the hose reaches the area in the basement, just under the sink, a cold water pipe (probably half inch) will be easily accessible. The kit comes with a self tapping valve that will allow the hose to hook up without any tools. It simply clamps on to the cold water pipe and presses a hole in it for the fridge water. They're okay, but I never trusted 'em to remain truly leak proof. So I always just make a trip to the hardware store and get the fittings necessary to install a regular valve for this. The water line kits are sold at Home Depot, Lowes, Manard's, and the like. The instructions are easy to follow. And for the distance you are dealing with, you may need to buy the needed length of flex hose separately, and discard the too short section in the kit.
Q:Valve Job?
Hows your oil pressure Does the engine rattle when first started after sitting awhile It's been known that if your bearings are wore it can also make your engine use oil,crank and cam bearings thats why i wanted to know how the oil pressure is.. For the price of a valve job it could cost anywhere from 300.00 all the way to 600.00 depending on if your valve need replacing or not..
Q:Mitral valve?
Your okorder.com/
Q:Idle air control valve cleaned?
There should be a VECI map under your hood that shows you where this valve is located. In a pinch, find a Haynes manual or a Robert Bentley manual that has pictures in it. If you can find the valve, you can clean it yourself with a can of spray Gum-out. While you're at it, clean the throttle body and PCV valve, too. Hopefully, you have had the good sense to have used only genuine Toyota coolant in this car, since Toyota heads require a special coolant formulation to prevent aluminum deterioration. More older Japanese engines are ruined with improper coolant than I can write about here. Sensor damage is caused as well! You might take your car to the Toyota dealer and ask them to clean out the valve for you. Since this is only a 2 minute job, they just might do it for free. If they do, at least offer to tip the technician under the table. Be sure to power wash your entire engine bay before you take the car in. They will LOVE you for this!!!
Q:what is the difference between 3 and 5 angle valve jobs?
Im not familliar with a 3 valve per cylinder but it either has two intake valves and one exaust valve or vice versa. IN this case it should have nothing to do with speed. I hope this helps
Q:what is the reason why non-return valves are installed in the discharge lines of the sea water pumps? ?
..?..non-return valves..? I will assume that your 'non-return valves', are what is also known as check valves. Check valves allows flow in one direction only. These are used wherever you need to prevent backflow into the system, or to maintain a charged circuit with fluid, until you choose to unload(depressurize ) it. Now, why are they used in discharged lines of salt water, basically to prevent backflow....reason not known, here , requires usage info.

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