Standard Fully Welded Steel Ball Valve API 6D Class 150 to 900 for Underground Gas Pipeline China Manufacturer

Standard fully welded steel ball valve

The standard fully welded steel ball valve is a type of ball valve that adopts a fully welded valve body structure, consisting of a carbon steel valve body and a stainless steel ball body. The flange connection is eliminated through welding technology to ensure zero leakage. The valve seat adopts carbon reinforced fluorone sealing gasket and inclined elastic structure, which can maintain reliable sealing in frequent operation, pressure fluctuations, and media containing impurities.

Mainly suitable for heating systems, industrial pipelines, urban gas and other scenarios, transporting water, oil, air and non corrosive fluids, with a temperature resistance range of -29 ℃ to 200 ℃, and a pressure rating of up to 42MPa.

Advantages include long lifespan, corrosion resistance, low maintenance, and suitability for harsh working conditions.

Get a quote

Adapt to complex working conditions
Application economy
Material and process advantages
Operational performance advantages
Sealing performance advantages
Structural design advantages

Adapt to complex working conditions

01
High pressure and high temperature compatibility
The unique self sealing design ensures more reliable sealing at higher pressures, making it suitable for harsh scenarios such as thermal power plants and oil and gas transportation.
02
Media universality
It can transport water, oil, gas, and non corrosive fluids with a wide range of diameters (from a few millimeters to several meters).

Application economy

01
Low maintenance cost
The leak free design reduces maintenance requirements, and the direct buried installation saves construction costs and time.
02
Long lifespan
Under normal operating conditions, the service life can reach more than 15 years, reducing the frequency of equipment replacement.

Material and process advantages

01
High strength forged steel valve body
Made of forged steel of the same material as the pipeline, it reduces uneven stress, enhances aging resistance and compressive strength.
02
Corrosion resistance
Stainless steel or special alloy materials can be selected according to the characteristics of the medium, suitable for corrosive environments such as chemical and gas industries.

Operational performance advantages

01
Quick opening and closing
Only need to rotate 90 ° to complete the switch action, with fast response speed, suitable for emergency cut-off or frequent adjustment working conditions.
02
Low operating torque
High precision ball machining and double O-ring valve stem sealing design, easy and unobstructed operation, supporting remote automation control.

Sealing performance advantages

01
Double sealing mechanism
The floating ball design utilizes the pressure of the medium to automatically press the valve seat, or the fixed ball seals with elastic preload force to compensate for wear and adapt to pressure fluctuations.
02
Corrosion resistant sealing material
The valve seat is made of elastic materials such as polytetrafluoroethylene (PTFE), forming a soft sealing structure with the metal ball. The sealing surface is isolated from the medium to avoid erosion and has a high leakage level.
03
Sealing performance advantages
The valve seat is made of elastic materials such as polytetrafluoroethylene (PTFE), forming a soft sealing structure with the metal ball. The sealing surface is isolated from the medium to avoid erosion and has a high leakage level.

Structural design advantages

01
Smooth flow channel
Adopting a straight through flow channel design, the medium passes unobstructed when the sphere is opened, with a small flow resistance coefficient and reduced pressure loss, suitable for high flow and high velocity scenarios.
02
Fully welded valve body
The integrated welding structure eliminates flange connections, has no leakage points, and is suitable for high pressure (up to 42MPa), high temperature (-29 ℃~200 ℃), and corrosive media.
03
Compact and lightweight
Small in size, lightweight, easy to install and maintain, especially suitable for buried or space limited scenarios.

Main Component Materials

Part Name	material
valve body	Carbon steel St37.8
Valve stem bearing	PTFE+SPCB
sphere	304 stainless steel
valve stem	2Cr13
valve seat	25%C+PTFE
metal washer	60Si2MN
spring	60Si2MN
O-ring	FPM
take over	Carbon steel St. 37.8
handle	Carbon steel+HCr
O-ring	FPM
press-fit sleeve	304

Performance Specifications & Dimensions

Nominal pressure PN

1.6/2.5/4.0/6.4/10.0/16.0
Shell F

P x 1.5
Sealing Pressure

P x 1.1
Medium

Water, air, oil, and other fluid media that do not undergo chemical reactions with carbon steel
Temperature (℃)

-29℃ ≤ t ≤ 200℃

DN(mm)	NPS(in)	A	B	L	D	D1		D2	weight （KG）
DN(mm)	NPS(in)	A	B	L	D	GB	EN	D2	weight （KG）
15	3/8	129	64	210	15	18	21.3	42	0.8
20	3/4	129	64	230	15	25	26.7	42	1.0
25	1	159	76	230	20	32	33.4	48	1.4
32	1 1/4	159	85	260	25	42	42.2	60	1.9
40	1 1/2	230	95	300	32	48	48.3	76	2.3
50	2	230	100	300	40	57	60.3	89	4
65	2 1/2	300	159	300	50	76	76.1	114	5
80	3	300	170	300	65	89	88.9	140	7
100	4	450	192	325	80	108	114.3	185	10.5
125	5	450	208	325	100	133	141.3	216	15
150	6	450	241	350	125	159	168.3	219	24

Note: The above data is for reference only. For details, please consult the company's sales department.

Valve Application

Oil & Gas Transportation

Oil and gas transportation involves multiple modes such as pipelines and ships, and is the core link of the energy supply chain.
Chemical Raw Material Control

The control of chemical raw materials covers the entire process of mining, storage, and production, ensuring safety and process stability.
High Temperature SteamPipeline in Power System

High temperature steam pipelines are the core of energy transmission in power systems, supporting the efficient operation of thermal and nuclear power plants.
Other Industries

Valves control fluids in multiple industries such as new energy and electronics, ensuring safe and efficient production.