Line / Flow Stop Equipment Overview
F4 manufactures Sandwich Valves / Slim Valves, with a compact design, provided with a reduced height while meeting all design requirements for the designated pressure classes. As a trusted line plugging machine manufacturer, we supply manually operated and hydraulically operated sandwich valves for line stopping applications across a wide range of pipeline conditions.
What is Line / Flow Stop Equipment?
Line stopping equipment is built to isolate pressurized pipelines and prevent any disruption during modifications, repairs, and valve installations. The system is made up of line stop machines, plugging heads, housings, and completion fittings — all selected for precision and reliability. Whether it’s routine maintenance, hot tap and line stop combination work, or a full pipe line stop on a critical section, the goal is the same: isolate the segment without shutting the whole system down.
F4 produces this equipment to align with ASME standards, with pressure ratings up to ANSI 600# and PN Series. We offer a product range spanning both small-diameter and over-48-inch pipeline sizes, depending on project requirements. F4 line stop solutions provide reliable performance, reduce downtime, and keep operations running — including for time-critical emergency line stopping and municipal line stopping work where service continuity is non-negotiable.
Manual | Hydraulic
Manual
Hydraulic
Aluminum Sandwich Valve
| Type | Size | Pressure Rating |
|---|---|---|
| Manually Operated | 2 Inch to 24 Inch | ANSI 150#, 300#, 600# & PN Series (Higher Pressure Rating can be supplied against specific request or orders) |
| Hydraulically Operated | 18 Inch to 48 Inch (Above 48 Inch can be supplied against specific request/Order) |
Line Stop Housing
This line stop housing is designed to hold the line/flow head and sealing element assembly during its operation and is crucial in performing line/flow stopping securely and efficiently. Based on the project requirement, F4 manufactures them either with or without a bypass branch-out port. Based on the project’s requirements.
Line Stop Heads
These line stop heads are a vital component of the line stop assembly, used to temporarily halt product flow within the pipeline. This is engineered to handle operational pressures; it enables safe and controlled stopping during repairs, modifications, or tie-ins. Their precision design ensures a secure fit, minimizing downtime and ensuring the system.
Sealing Elements
The line stop assembly uses sealing elements in line stop equipment to close the gap between the pipeline’s inner diameter of the pipeline and the plugging head. This creates a dependable seal that effectively prevents the flow of products. These are available in pre-drilled and ground to size or drilled and unground and can be manufactured according to customer specifications.
| Equipment | Sizes | Pressure Rating |
|---|---|---|
| Line / Flow Stop Housing | 2 Inch to 48 Inch | ANSI 150#, 300# & 600# & PN Series (Higher Pressure Rating can be supplied against specific request/orders) |
| Line Stopping / Plugging Heads | 2 Inch to 48 Inch | ANSI 150#, 300# & 600# & PN Series (Higher Pressure Rating can be supplied against specific request/orders) |
| Sealing Elements | 3 Inch to 48 Inch | NBR, EPDM, Viton, Neoprene, and Polyurethane materials |
(Above 48 Inch can be supplied against specific request/Order)
Mechanical Folding Line Stop Head
F4 designs and manufactures fabricated Mechanical Folding Line Stop Heads for large diameter, low-pressure pipelines, and also supplies line stop equipment for sale. This equipment is best suited for branch connections where equipment attachment is required and where equipment needs to be connected, reducing overall project costs. They can be used on pipelines with operational pressures up to 8 bar and are suitable for line stop operations on pipeline sizes from 14 inches to 102 inches (custom sizes also available on request). The smaller-sized equipment enables the maintenance of the original strength of the pipeline.
Line Stop Actuators (Hydraulic Actuators)
Line Stop Actuators use hydraulic cylinders to position and actuate the line stop head during the line/flow stop operations.
Hydraulic Actuators
| Part Number | Description | Control Bar Travel | MAOP | Control Bar DIA |
|---|---|---|---|---|
| F4-LSA-0412 | 4 Inch to 12 Inch Hydraulic Actuators | 72 Inch | 1000 | 1480 PSI | 2.5 Inch |
| F4-LSA-1418 | 14 Inch to 18 Inch Hydraulic Actuators | 103 Inches | 1000 | 1480 PSI | 3.5 Inch |
| F4-LSA-1424 | 14 Inch to 24 Inch Hydraulic Actuators | 110 Inches | 1000 | 1480 PSI | 3.5 Inch |
| F4-LSA-2234 | 22 Inch to 34 Inch Hydraulic Actuators | 140 Inches | 1000 | 1480 PSI | 4 Inch |
| F4-LSA-2234 XL | 22 Inch to 34 Inch Hydraulic Actuators | 150 Inch | 1000 | 1480 PSI | 4 Inch |
| F4-LSA-3648 | 36 Inch to 48 Inch Hydraulic Actuators | 150 Inches | 1000 | 1480 PSI | 6 Inch |
| F4-LSA-3648 XL | 36 Inch to 48 Inch Hydraulic Actuators | 180 Inches | 1000 | 1480 PSI | 6 Inch |
| F4-LSA-48 PLUS | And Above 48 Inch | 180 Inches | 1000 | 1480 PSI | 8 Inch |
| F4-LSA-48 PLUS XL | And Above 48 Inch | 200 Inches | 1000 | 1480 PSI | 8 Inch |
Line Stop Actuators (Manual Jack Screw)
Line/flow stop operations on pipelines below 18 inches are actuated and positioned through the Manual Jack Screw that can be used on high and low-pressure pipelines.
Jack Screw (Manual) Actuators
| Part Number | Description | Control Bar Travel | MAOP |
|---|---|---|---|
| F4-MJS-0203 | 2 Inch & 3 Inch | 30 Inch | 1000 | 1480 PSI |
| F4-MJS-0405 | 4 Inch to 5 Inch | 48 Inches | 1000 | 1480 PSI |
| F4-MJS-0612 | 6 Inch & 12 Inch | 60 Inch | 1000 | 1480 PSI |
| F4-MJS-1424 | 14 Inch to 24 Inch | 72 Inches | 1000 | 1480 PSI |
Power Stop
The Power Stop is a piece of equipment that weighs less, ranging in size from 3 inches to 12 inches. It is factory tested to 24 bar and operates at up to 16 bar. The sealing head increases by 20 mm, providing an effective seal in the pipe, irrespective of ovality. The power stop that is operated hydraulically is supplied with a power unit. F4 has also developed a cleaning tool that gives the contractors an opportunity to look inside the pipeline and clear any deposits before installing the power stop heads. The system also has a tool for removing lost coupons.
| Operation Type | Sizes |
|---|---|
| Manually Operated | 3 Inch, 4 Inch, 5 Inch, 6 Inch & 7 Inch |
| Hydraulically Operated | 6 Inch, 7 Inch, 8 Inch, 9 Inch, 10 Inch & 12 Inch |
Pipe Freezing Jackets
The Pipe Freezing Jackets freeze the product inside the pipe, creating a solid ice plug that will enable modifications or valve exchanges without the need to shut down the system or drain the product out of the pipeline.
Size : ½ Inch to 24 Inch NB Pipes (Above 24 Inch can be supplied against specific request/orders)
MOC : Aluminium / SS 304
Why Choose Line/Flow Stop Equipment?
- Allows maintenance, repair, or modification without shutting down the system entirely
- Perfect for piping line stop diversions, re-routing, or adding new sections
- Facilitates safe shutdown and gradual system isolation via a controlled line stopping procedure
Key Features and Applications of Our Line/Flow Stop Equipment
- It allows safe operations with controlled temporary isolation of active pipelines.
- Enables valves to be installed, branches to be connected, or sections to be replaced without draining
- Operates well under a low-pressure and high-pressure pipeline system
- Compatible with carbon steel, ductile iron, PVC, GRE, and other frequently used piping materials
- The ability to work under severe temperature and pressure conditions is designed with safety in mind
- Designed to suit particular pipeline diameters, lengths, and types of pressures
Why Choose F4
- Engineering Excellence Proven
Exacting hardware developed to give reliable performance in harsh field environments. - Full Project Support
We offer fully integrated customer support and on-site technical guidance, including a dedicated line stop service during initial design and commissioning. - Custom-Built Solutions
Customization of designs to meet specific operational needs that are very safe and efficient in operation.
Frequently Asked Questions
1. How quickly can the equipment be installed and removed on-site?
It actually depends on the size and type of the pipeline, but the F4 system is engineered to minimize downtime and keep operations running smoothly for any pipeline stop project.
2. Which pipe material is compatible with line stopping equipment?
F4 line stop machines and line stop valve are compatible with carbon steel, ductile iron, PVC, GRE, and other commonly used pipeline materials.
3. Do we need any specialized training to operate this system carefully?
Yes. We provide operator training and technical support to ensure efficient and safe operation. Minimal training is needed for smaller systems, while double line stop units may require trained personnel.
4. Is a temporary or rental deployment option available?
Yes, F4 offers line stop equipment for sale for short-term or project-based needs, allowing flexible deployment without buying the whole equipment
Talk Directly to the Manufacturer
Send your requirement and our engineering team will respond with a quote — typically within 48 hours.
- Phone: +91 7899 818099
- Email: info@f4holdings.com
- Hours: Mon–Sat, 9:00 AM – 6:00 PM
Request a Quote
Fields marked * are required.