Ductile Iron Pipes with high performance good price
- Ref Price:
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- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 100 m.t
- Supply Capability:
- 1000 m.t/month
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full welded forged steel ball valve
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.
（Ⅰ）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.
（Ⅱ）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.
（Ⅲ）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 GB、GB/T JB、JB/T JIS customize |
Test Standard | API 6D customize |
Face to Face | API 6D customize |
Pressure-teperature rating | ASME B 16.34-2004 customize |
Marking | 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 9001、ISO 14001、API 6A、API 6D、TS CE、API607/6FA/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.
- Q: Are ductile iron pipes prone to leakage?
- Ductile iron pipes are generally considered to be resistant to leakage. This type of pipe is known for its durability and strength, making it less prone to leaks compared to other materials like PVC or even cast iron pipes. Ductile iron pipes are designed to withstand high pressure and can withstand heavy loads, making them ideal for various applications such as water supply, sewage systems, and industrial pipelines. The unique properties of ductile iron, including its flexibility and ability to absorb vibrations and shocks, contribute to its resistance against leaks. Ductile iron pipes have a high tensile strength, which means they can handle the internal and external pressures exerted on them without cracking or breaking. Furthermore, ductile iron pipes have joints that are designed to be leak-proof. These joints are typically sealed with rubber gaskets and connected using various methods such as push-on joints or restrained joints with mechanical couplings. These joint designs ensure a secure and watertight connection, reducing the risk of leaks. However, like any other type of pipe, ductile iron pipes can still experience leaks under certain circumstances. Factors such as age, corrosion, poor installation, or ground movement can contribute to the development of leaks over time. Regular maintenance and inspections are important to identify and address any potential issues that may lead to leaks. Overall, while ductile iron pipes are generally resistant to leakage and known for their reliability, it is essential to ensure proper installation, regular maintenance, and timely repairs to maximize their longevity and prevent any potential leaks.
- Q: Are ductile iron pipes resistant to acid attacks?
- Yes, ductile iron pipes are generally resistant to acid attacks. Ductile iron is a type of cast iron that has been treated with magnesium to improve its strength and ductility. This treatment creates a more resistant material that can withstand corrosive environments, including acids. However, it is important to note that the level of resistance may vary depending on the specific acid and concentration involved. In highly corrosive environments, such as those with strong acids or high concentrations, additional protective measures such as lining or coating the pipes may be necessary. Additionally, regular inspection and maintenance are also important to ensure the long-term durability and resistance of ductile iron pipes.
- Q: When the ductile iron pipe is pressed, the three links are always running out. What should be done?
- This situation depends on whether the pipeline installation is in place and the apron installation is standard. If there are no other problems, it is recommended to play a cement pier, half a pack of three can be solved.
- Q: How do ductile iron pipes handle ground movement near rivers and lakes?
- Ductile iron pipes are highly suitable for handling ground movement near rivers and lakes. Their inherent flexibility and durability make them resistant to ground instability. They can withstand minor shifts and settle with the movement without cracking or breaking. Additionally, their sturdy construction and high tensile strength allow them to adapt to changing soil conditions, ensuring the integrity and longevity of the pipeline system in these areas.
- Q: Which is better, ductile iron pipe and spray plastic pipe?
- Spray pipe is: plastic composite pipe, steel pipe is a new composite material as matrix, through a special process in high temperature curing by walls melt spraying or adsorption of food grade epoxy powder coating or PE as raw material. It has excellent corrosion resistance and relatively small frictional resistance.
- Q: How much is a ductile iron pipe dn400?
- High quality cast iron ductile iron pipe with low phosphorus and low sulfur iron making production of blast furnace, according to the current international advanced centrifugal casting, annealing process, water-cooled metal type centrifugal pipe casting machine casting, after annealing, socket dressing, pressure test, internal lining layer of cement, cement treated lining, water and health cement lining, outer wall coated with asphalt paint, asphalt paint baking, socket antirust processing, spray marks and other procedures for the packaging, with high strength, high elongation, corrosion resistance of a body strong as iron.
- Q: What is the disadvantage of nodular cast iron in excess of silicon?
- Therefore, the increase of silicon content in nodular iron greatly improves the strength index and reduces toughness. Ductile iron has a greater crystalline undercooling and a tendency to chill when treated by spheroidizing, and silicon reduces this tendency.
- Q: Why does the cast iron pipe always run off when testing?
- If the pipe is exposed for pressure test, you must add a pier, or else the fittings fly out. You are not surprised. At the same time, the pressure test before the ink tube to make full immersion bubble discharge clean, or a big easy gas pressure pipe explosion.
- Q: How can the cast iron pipe of the ductile iron pipe be repaired?
- If it is ductile cast iron pipe, then use the plugging device can be used in the mouth of the big head plugging device, then use ordinary plugging device, if it is bent, we need on-site survey to do plugging device
- Q: The difference between ductile iron pipe and steel pipe used in pipe jacking
- Comparison between ductile iron pipe and universal cast iron pipe: the process of making ductile iron pipe is cast by adding alkaline earth metal or rare metal such as magnesium and calcium in the raw material of common cast iron pipe.
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Ductile Iron Pipes with high performance good price
- Ref Price:
-
- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 100 m.t
- Supply Capability:
- 1000 m.t/month
OKorder Service Pledge
OKorder Financial Service
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