Full Welded Forged Steel Ball Valve DN 28 inch

Ref Price:
Loading Port:
Payment Terms:
Min Order Qty:
10 pc
Supply Capability:
100 pc/month

OKorder Service Pledge

Quality Product

Order On-line Tracking

Timely Delivery

OKorder Service Pledge

Credit Rating

Credit Services

Credit Purchasing

Share to:

Product Description:

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.

Send a message to us:

Remaining: 4000 characters

- Self introduction

- Required specifications

- Inquire about price/MOQ

Q:1993 pontiac bonneville bad egr valve question ?
could be egr or fuel pressure regulator. while running pull vacuum line off of regulator if fuel is present its bad .
Q:Intake/Exaust valves? Im stupid?
You're not dumb for trying to learn. In a 4 stroke engine the air goes into the intake manifold and into the intake ports on the head. There it interacts with the valve, which when opened allows the air to be drawn into the cylinder. Then the engine goes through the power stroke and then the exhaust is forced out through the exhaust valve.
Q:Need to find my main water supply valve...?
My water hose has a valve at the base of it close to the wall, if you need to shut off the main supply to the house it is usually located in the front yard close to the street. Mine have always been enclosed in a Cement type box that is in-ground with a lid that is flush with the ground.
Good call, it most likely is the valve clearance. As the valves wear, they get tighter until they actually stay open a bit (when cold). As the engine warms up, the aluminum head pushes the cam away from the valve stems a bit, and some clearance comes back. Check 'em, adjust 'em, and you should be good to go. For most chinese 150's, you'll need to remove the plastic around the engine, then pull off the valve cover - you'll see the rocker arms inside, with locking nuts and adjustment screws. Set the crank at TDC on the compression stroke (about 1/2 turn after the intake valve closes) and then adjust the clearance - get specs from your manual, or just make sure that there's at least 0.1 mm gap if you don't have the specs.
Q:Mountain bike presta/shrader valve?
You can get tubes with presta valves at places like Nashbar or Performance for about what schrader's cost at Walmart. Besides, the one time I got a tube at Walmart was a disaster. It split down a seam when I was 15 miles from home. Completely unpatchable, and I couldn't get anyone on the phone. A long walk. DON'T DRILL YOUR RIM. It would probably be OK, but you don't want to chance a weak spot on such an important part of your bike.
Q:Water heater leak around relief valve?
close off the chilly water grant to the water heater and additionally close the gas grant or the heater administration. Drain the water heater (this might drain all your homestead warm water besides). Open a warm water sink valve to enable air enter. Drain the water till the water is below the threads. decrease or unsolder the joints mandatory to get rid of the threaded setting up. get rid of the setting up, and positioned across it to a community plumbing grant homestead and get a clean one. set up the hot one with teflon tape. close the sink warm valve. Open the chilly water grant valve on the water heater slowly. verify for any leaks. If its leaking, initiate over. If not resolder the copper joints jointly, and be confident to purge the air by way of your sink back. or in basic terms call a plumber or an HVAC business company.
Q:Motorcycle Valve Seal (When to replace?)?
A 'leak-down' test is the best bet, shows where in the system the compression is leaking and if it's around the valve stems than for sure the seals need replacing. Can't judge it by the smoke accurately as oil could be slipping past the rings also.
Q:Water Valve help needed please?
You can shut it off from there and if you feel confident with your plumbing abilities, take apart your valve take all those parts to the hardware store. I highly suggest either a mom pop hardware store or a local plumbing supply over a big box like Lowes or HD. The big box employees are NOT plumbing experts. I had the same issue with my valve when I bought my place I swapped out what I needed have never had a drip since then.
Q:how do i open the power valves?
remove the carb abd intake manifold, they are inbetween the intake and reed cage. you will have to rejet .
Q:valve cover question?
If your asking if the Valve cover will be full of oil..... No it runs back into the oil pan. There will be oil residue inside and it might drip a tiny bit when you remove the cover but.....

1. Manufacturer Overview

Year Established
Annual Output Value
Main Markets
Company Certifications

2. Manufacturer Certificates

a) Certification Name  
Validity Period  

3. Manufacturer Capability

a)Trade Capacity  
Nearest Port
Export Percentage
No.of Employees in Trade Department
Language Spoken:
b)Factory Information  
Factory Size:
No. of Production Lines
Contract Manufacturing
Product Price Range