1 Piece Reduced Port Ball Valves – 316 Stainless Steel 

1-piece ball valves, also known as 1 pc ball valves, are compact two-way quarter-turn shut-off valves designed for threaded piping systems. These stainless steel one-piece ball valves feature a single-piece body construction and a standard (reduced) port bore. Rated to 1000 WOG (Water, Oil, Gas), they are commonly used in water, oil, gas, and general industrial applications where durability, compact size, and cost efficiency are important, and full port flow capacity is not required.

1-piece stainless steel ball valves are a cost-effective option for controlling flow when a simple on/off action is required. The robust one-piece body has no body joints, reducing potential leak paths. This threaded two-way ball valve is designed for durability and long service life in demanding industrial environments. 1 piece ball valves feature a standard (reduced) port, meaning the internal bore is smaller than the pipe size. In many catalogs, standard port and reduced port are used interchangeably; both refer to a reduced bore ball valve with an internal bore smaller than the nominal pipe size. As a reduced-bore ball valve, this design provides reliable shut-off performance while maintaining a more compact body than full port stainless steel ball valves. Available in sizes from 1/4" through 2" for threaded industrial piping systems.

For applications requiring maximum flow capacity with no internal restrictions, see our  Full Port Ball Valves

For higher pressure applications, consider 2000 PSI ball valves.

For systems requiring inline maintenance without removing the valve, see our 3 piece ball valves.

Advantages:

• ● Reduced risk of leakage due to single-piece body construction
• ● Cost-effective alternative to multi-piece ball valves
• ● Compact valve body for space-restricted installations and OEM equipment
• ● Serviceable through threaded end connections without splitting the body
• ● Stainless steel construction for durability and long service life

Consideration: Reduced flow rate due to standard (reduced) port design.

Features:

Key specifications for 1 piece stainless steel ball valves include:

• ● Suitable Media: Water, Oil, and Gas (WOG)
• ● Threads: Female NPT
• ● Port: Standard Port Ball Valve (Reduced Port)
• ● Pressure: 1000 WOG (Water, Oil, Gas) - 1000 PSI (6.4 MPa) at ambient temperature
• ● Temperature: -4°F to 302°F (-20°C to 150°C)
• ● Stem: Blow-Out Proof 
• ● Handle: Lever type with locking device
• ● Seats and Seals: Teflon (PTFE)
• ● Body Material: Stainless Steel 316 (CF8M)
• ● Non-Wetted Components:  304 Stainless Steel

One Piece Ball Valve Dimensions 

1 piece ball valves are available in sizes ranging from 1/4" through 2", depending on configuration. As a standard (reduced) port ball valve, the internal bore will be smaller than the nominal pipe size, resulting in a more compact body compared to full port designs. Refer to the dimensional drawings below for detailed sizing information.

One Piece Ball Valve Material List

Material composition details are provided below and may vary slightly by size.

One Piece Ball Valve Pressure Chart

Pressure ratings are based on operating temperatures; refer to the chart below for application guidance.

Why Choose 1 Piece Ball Valves

1 piece ball valves are selected for applications where compact size, cost efficiency, and reliable shut-off are the primary requirements. The single-piece body design reduces potential leak paths while maintaining a durable and space-saving construction for threaded piping systems.

• Compact design for space-restricted installations
• Cost-effective solution for general shut-off applications
• Reduced leak paths due to one-piece body construction
• Suitable for a wide range of industrial fluid systems

When to Choose 1 Piece Ball Valves

1 piece ball valves are best suited for systems where space is limited and full port flow is not required. They are commonly used in general industrial applications where a simple and reliable shut-off valve is needed.

• Applications where compact size is important
• Systems where slight flow restriction is acceptable
• Cost-sensitive installations
• General-purpose water, oil, and gas systems

Servicing a 1-piece Ball Valve

Although 1-piece ball valves have a single-piece body, their internal components can be serviced through the threaded end connections. This allows seat and seal replacement without separating multiple body sections, reducing potential leak paths while simplifying maintenance in threaded industrial systems. Servicing typically includes replacing seats and seals using common hand tools.

How a 1 Piece Ball Valve Works

A one-piece ball valve is a type of quarter-turn ball valve, meaning the handle rotates 90 degrees to open or close flow. Internally, a precision-machined stainless steel ball with a reduced bore rotates within PTFE seats to open or shut off flow. When the internal bore is aligned with the pipeline, fluid flows through the valve with the characteristic restriction of a standard (reduced) port design. When the handle is turned perpendicular, flow is completely shut off. This simple operation makes 1-piece ball valves ideal for reliable on/off control in threaded industrial systems. It functions as a two-way ball valve, allowing bi-directional flow in threaded piping systems.

1 Piece vs 2 Piece vs 3 Piece Ball Valves

The primary differences between 1-piece, 2-piece, and 3-piece ball valves involve body construction, internal bore size (standard vs full port), and servicing method.

• 1 Piece Ball Valve – Manufactured with a single-piece body and typically a standard (reduced) port bore. This design is the most compact and cost-effective option for threaded piping systems. Modern 1-piece ball valves allow internal component access through the threaded end connections, enabling seat and seal servicing without splitting a multi-piece body. This simplifies maintenance while maintaining a reduced leak path.

• 2 Piece Ball Valve – Constructed with two threaded body sections, typically featuring a full port bore for maximum flow capacity. The valve can be removed from the pipeline and disassembled for servicing.

• 3 Piece Ball Valve – Designed with a three-section body that allows inline servicing without disturbing the threaded pipe connections. Commonly used in applications requiring frequent maintenance or cleaning.

For applications where compact size, cost efficiency, and simplified servicing are priorities, a 1 piece standard port ball valve is often preferred. Where maximum flow rate or frequent inline servicing is required, 2-piece or 3-piece full port ball valves may be more appropriate.

For applications requiring higher flow capacity or inline servicing, consider full port ball valves or 3 piece ball valves.

Common Applications for 1 Piece Stainless Steel Ball Valves 

1 piece ball valves are commonly used in:

• General industrial water systems
• Oil and fuel transfer lines
• Compressed air systems
• Chemical-compatible fluid lines
• OEM equipment and skid systems
• Compact process installations

Because they are a standard (reduced) port design, they are best suited for systems where a slight pressure drop is acceptable and maximum flow is not critical.

Threaded NPT Connections

These valves feature female NPT threaded connections on both ends. NPT (National Pipe Thread) is a tapered thread design commonly used in industrial piping systems. The tapered profile creates a secure mechanical seal when properly tightened, making NPT ball valves suitable for water, oil, gas, and general-purpose fluid handling applications. Threaded stainless steel ball valves with female NPT ends are widely used due to their reliability, availability, and ease of installation.

Frequently Asked Questions – 1 Piece Ball Valves

What is a 1-piece ball valve?

A 1-piece ball valve is a quarter-turn shut-off valve with a single-piece body construction. It is compact, cost-effective, and typically designed with a standard (reduced) port internal bore.

Is a 1-piece ball valve full port?

No. Most 1-piece ball valves are standard (reduced) port, meaning the internal bore is smaller than the pipe size. This results in a compact valve body and a slight pressure drop compared to full port designs.

Is a 1-piece ball valve serviceable?

Yes, although manufactured with a single-piece body, modern 1-piece ball valves can be serviced through the threaded end connections, allowing seat and seal replacement without separating multiple body sections.

What is a standard port (reduced port) ball valve?

 Standard/reduced port means the internal bore is smaller than the pipe size, creating a slight pressure drop but enabling a more compact, cost-effective valve.

What is the difference between 1-piece and 2-piece ball valves?

A 1-piece ball valve features a single-piece body and a reduced port bore, making it more compact and economical. A 2-piece ball valve typically has a full port bore and can be disassembled for servicing.

Are 1-piece ball valves 2-way?

Yes. A 1-piece ball valve is a 2-way quarter-turn shut-off valve, which means it allows bi-directional flow in either direction through the threaded ports.

What does 1000 WOG mean?

1000 WOG means the valve is rated for up to 1000 PSI in Water, Oil, and Gas service under normal operating temperatures.

When should I use a standard port ball valve?

Standard port (reduced bore) ball valves are ideal for:

• General shut-off applications
• Space-restricted installations
• Systems where maximum flow is not critical
• Cost-sensitive industrial projects

Types of Stainless Steel Ball Valves 

Stainless steel ball valves are manufactured in one-piece, two-piece, and three-piece body designs. Each construction type offers different advantages depending on the application, flow requirements, and maintenance needs.

• 1 Piece Stainless Steel Ball Valves – compact valves with a single-piece body design and reduced leak paths.
• 2 Piece Full Port Threaded Ball Valves – durable two-body construction with full port flow capacity.
• 3 Piece Stainless Steel Ball Valves – designed for easy maintenance and servicing in industrial piping systems.

Specifications: