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special valve for high temperature and high pressure power station.

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API lever flange DBB ball valve

GZP Ball Valves are manufactured to the latest edition of API 6D, API608, BS5351 and ASME BE 16.34 and tested to API 598
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Product description

Introduction video of DBB ball valve:

GZP Ball Valves are manufactured to the latest edition of API 6D, API608, BS5351 and ASME BE 16.34 and tested to API 598. All valves from GZP VALVE are strictly 100% tested before shipment to guarantee zero leakage.
The DBB ball valve is a double-closed double-break and relief function valve. When the valve is pressurized at both ends, the medium in the valve cavity can be discharged from the valve's sewage or vent valve, and the upstream and downstream media of the valve will not continue to enter the valve cavity. , Almost double truncated. When the middle chamber is at high pressure, the valve seat can automatically release pressure, that is, release. Suitable for aviation kerosene, light oil, natural gas, liquefied gas, pipeline gas, chemical media and other pipelines
The range of GZP Metal seat Ball valve design is as follows:
1.Size: 2” to 48”   DN50 to DN6001200      
2.Pressure: Class 150lb to 2500lb  PN10-PN420    
3.Material: Carbon steel and stainless steel and other special materials.
           NACE MR 0175 anti-sulfur and anti-corrosion metal materials
4.Connection ends: ASME B 16.5 in raised face(RF), Flat face(FF) and Ring Type Joint (RTJ)
ASME B 16.25 in butt welding ends and thread.
5.Face to face dimensions: conform to ASME B 16.10.
6.Temperature: -29℃ to 280 ℃
GZP valves can be equipped with gear operator, pneumatic actuators, Hydraulic actuators, Electric actuators, bypasses,locking devices,chainwheels,extended stems and many others are available to meet the customers’ requirements.
Technical data



API 6D, ASME B16.34, ISO 14313, ISO 10423, ISO 17292

Pressures range

ANSI 150 ~ANSI 2500 ,PN10~PN420

Size range

DN50(2") ~DN1200 (48")

Body Material

Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel.etc.


NACE MR-01-75/NACE MR-01-03 Special Requirements

Face to face

API 6D, ASME B 16.10,EN 558,DIN3202

Fanged RF, FF, RTJ Ends

ASME B16.5 ≤ DN600 (24") ASME B16.47 A ≥ DN650 (26")

BS 4504,DIN 2543-2545,EN1092

Butt-Weld BW Ends

ASME B16.25 ,DIN 3239,BS 2080, EN 12627

Temperature range

-29°~ 425°C

Design feature



One,Two or Three piece body and Welded body


Full bore and Reduced bore

Ball Type

Floating ball and fixed ball


Blowout-proof stem

Seat Sealing

Front-seat sealing, Back-seat sealing, bi-directional sealing

Valve Operation

Gear,pneumatic,Hydraulic,Electric actuators.

By passes,locking devices,extended stem,etc

Fire Safe

API 607, BS 6755, ISO 10497-5

Other design

Anti-static design,automatic pressure relief design, emergency grease injection design, drain valve, anti-corrosion design, anti-sulfur design,etc

Inspection and Test


Visual Inspection


Material Inspection

PMI Test----Chemical Analysis

HB Test---Hardness Test

UT---Ultrasonic Test

RT---Radio-graphic Test

MT---Magnetic Test

NDT Test Non-destructive

Dimension inspection

According to drawings

Valve Inspection and Test

API 598,DIN 3230,EN 12266,BS 5146


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