Whether it’s district heating, city gas pipeline, oil and gas storage project, LNG pipeline or power station, get Professional, safe and reliable fully welded ball valves that fit your budget.
We are making a HUGE promise to you!
Whether it is the trader, importer, brand, manufacturers, wholesaler, distributor or construction contractor that need fully welded ball valves, get the high-quality ball valves at the lowest possible price from Grande.
Specification
Body material
- Body: A105、Q345B、20
- Side body: A105、Q345B、20
- Valve stem: 20Cr13、410
- Valve ball: A105+ENP、304
Inspection Standard:
GB/T 13927
Design standard:
GB/T 37827 GB/T 12237 ISO 17292
Parameters:
Size range: DN300 ~ 800,
Pressure: PN25;
Temperature: -46~80℃
Standards:
- Design stanard: API 6D、 GB/T30818
- Structure length: API 6D、 GB/T30818
- Butt welding end: ASME B16.25、GB/T12224
- Inspection standard: API 6D、 GB/T30818
- Fire safty: API 607
Fully welded ball valve
Production Process
Raw material
All suppliers are selected strictly. Upon arrival, quality inspectors will conduct strict inspection of the materials. Products that do not meet the requirements will never be put into storage, and core components will be processed and produced independently
Assembling
The special tooling mold makes our assembly more accurate and minimizes the risk of leakage.
Welding
Welding workers are certified to work after rigorous welder skill evaluation and welding process evaluation.
Advanced welding equipment such as Panasonic welding machines and automatic welding robot arms are used to ensure efficient, beautiful and reliable welding.
Pressure test
Strict pressure inspection procedures, advanced pressure test equipment, and complete inspection files ensure the stable product quality.
Later stage
Insignificant details can better demonstrate the powerful processing ability, Our work standards are no dead ends, and meticulous specifications
Fully welded ball valve
High quality accessories
Strict quality control with the raw material and valve parts, to get an excellent combination solution with better quality and lower cost, which could ensure the service life of our valves with 30 years.
Valve ball
The valve ball is self-produced with high roundness.
Roundness is a key indicator that affects valve life.
The roundness of Grande-tek’s valve ball is below 0.02mm, and the surface roughness is
The coating thickness is uniform, and the ball material is guaranteed to meet the national standard.
Side body
Overall forged, zero stucking
The overall forged structure is much stronger than the pipeline.
When the stress is transmitted through the valve, the stress on each part of the valve is far from the yield strength of the material, and the inside of the valve will not be deformed due to pipeline stress, the valve seat, ball seal and valve action are completely unaffected, and the occurrence of “valve stucking” is prevented from the structural design.
Pretensioning mechanism
Independent design, imported wire
Japan: DAIKIN USA: 3M
Long-term use without fracture, deformation, and relaxation (good fatigue resistance, long-term compression without attenuation) and other faults.
The uniform distribution of multiple springs ensures that the force on the entire circumference of the valve seat is even to ensure a reliable seal.
Valve seat
Imported raw materials, the sealing surface width is 3 times higher
PTFE (imported) +25%C, the effective sealing surface width is more than 3 times that of peer manufacturers.
Original imported DAIKIN.PTFE (JP) or 3M PTFE (USA) raw materials.
Upper stem mechanism
Flexible rotation, reliable sealing
1. The stem material is AISI 420/AISI 410/AISI 4140;
2. Valve stem explosion-proof design
3. 3 German Bode Dynamic GMBH O-rings + 5 PTFE rings ensure that the valve does not leak.
4. 2 dry bearings effectively reduce the rotational friction of the valve stem.
5. Circlip design, the gland will not loosen during use.
Actuator
Imported reducer
Rotork from England/ Sambo from Korea
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Main products are fully welded ball valves for heating and gas.