China supplier big size steel ball valve

China supplier big size steel Ball Valve  Standard ball valves ,OEM valve parts as your drawings  ,all available here in Densen!   Technical Parameter for fully welded ball valve: Nominal Diameter: DN20~DN1400 Nominal Pressure: 1.6-4.0MPa Applicable temperature:  -40~200℃ Connection Type: Butt welded/Flanged/Threaded/ Threaded flange Operation: Manual/with gear/electrical/worm gear/pneumatic/hydraulic  Standard: GB/T12237-2007,API6D,GOST,ASME B16.34,ISO 9001,KC,TS. Fully welded ball valve advantages: 1. Integral seamless steel tube pressed full-auto welded without leaking outward. 2. PTFE+25% carbon fiber and disc spring feely compensating structure zero leakage. 3. Directly buried without need of a high ground well,saving the engineering cost. 4. Both valve and pipeline are made of the same material, without the condition of uneven stress. 5. Multiple connection combination , fire and electrical prevention design, using in the special working conditions. 6. Maintenance-free for 20 years. Specification Sheet:

Type of construction	Normal; Resist SSC; Welded flange ball valve; Heating ball valve; Gas ball valve;   Pipeline ball valve; Buried design ball valve
Fully welded ball valve operated	N/A for lever operated; Electro-hydraulic operated; Pneumatic operated;  Pneumatic operated with manual; Hydraulic operated;  Hydraulic operated with manual; Pneumatic-Hydraulic operated;   General electric operated; Explosion-proof electric operated
fully welded ball valve type	Normal; Resist SSC; Welded flange ball valve; Heating ball valve; Gas ball valve;   Pipeline ball valve; Buried design ball valve
Type of connection	Female thread end; Male thread end; Flange end; Welding end;  Wafer type; Hooped end

      China supplier big size steel ball valve  Test (1)Shell Hydrostatic Test  

ANSI B 16.34 Section7.1
Valve Size NPS	Test pressure	Test Time. Sce
Below DN 50	1:5 times the 100°F	15 Sce
DN 65~DN 200	Rating of  ANSI  Class	60 Sce
Up DN 250	Max. Operating Pressure	180 Sce
	Test pressure should be above 1.5 times  than the valve's Max work pressure (100F)

  (2) Seal Hydrostatic Test   The pressure should be more 1.1 times than working pressure by seal hydrastatic test  

ANSI B 16.34 Section 7.2
Valve Size NPS	Test pressure	Test Time. Sce
below DN50	1:1 times the 100°F	15 Sce
DN65~DN200	Rating of  ANSI  Class	30 Sce
above DN250	Max. Operating Pressure	60 Sce
	Test pressure should be more 1.5 times  than the valve's Max work pressure (100F)	180Sce

  (3) Seal Air Test   Seal air leakage test is based on 80PSIG(6kgf/cm2) inert-gas or the air reach the test pressure, then close the valve. after that check the valve whether it is leakage or not. Quality control

Quality Control

Professional precision manufacturer for more than 10 years. 1. Quality control: The defective products rate is 0.1%. Imported material 100%. 2. Experienced &Responsible QC that you can reply on. 3. Each part would be given 100% test and tryout before shipment. 4. Adequate supply capacity. Punctual delivery time. 5. Best after sales service is provided.

  Production process   Our Services What New Densen can do for our worldwide customers:   New densen supply the ball valves,  check valves, globe valves, butterfly valves and ANSI, DIN, JIS, GOST standard gate valves, valve parts and Casting ,Forging products. If you need  Non- standard products , according to your drawing, we can produce the products as your  request. OEM AND CUSTOMIZED SERVICE:   One-stop service,Meet your unique needs!
  Customized Casting,Forging,Stamping,Machining,Welding&Fabrication Service Packaging & Shipping   Export packing: we can also design as clients requirement.   Company Information We are specialized in manufacturing standard ball valves, butterfly valves,gate valves, globe valves,  nonstandard valves, valve parts and other casting and forging products as clients drawings. Our valves are suitable for the market aboard, such as Europe, America, the Middle East and Southeast Asia, etc. and enjoying a high reputation among our customers.     FAQ FAQ: Q1:Are you a manufacturer or a trader? We are manufacturer ,our own factory is located in Liaoning province,China Q2:How do you protect customer's  right? New Densen's work habit is to sign confidential agreement with own/outside factories all the time before start any project. Also New Densen has signed confidential agreement with all its staffs.  Q3:How long shall we get the quotation? Processing time for Enquiries :1-3 days Q4:What is your payment term? Payment term: 1)Pattern and tooling: 50% prepaid as order deposit; balance 50% paid within 10 days after samples approved. 2)Samples: 50% prepaid as order deposit; balance 50% paid within 10 days after samples approved. 3)Products: 30% prepaid as order deposit;70% paid before EX-work. Q5:How to control the quality of ball valve? 1)Select high quality raw material. 2)Strict required during machining. 3)Seat material comply with food grade. 4)Tested twice to insure zero leakage. Q6:What shall we do if the quality is not meet our requirement? If that is the case after we re-test,we can repay the payment or re-produce until it reach the quality   If there is any chance we can help, please just feel free to contact us at any time :  

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