Gate Valves
Verified by Mel Sykes, Industrial Supply Chain Specialist - April 2026
| Specification | Details |
|---|---|
| Types | Rising stem, non-rising stem, wedge gate, parallel slide, knife gate |
| Materials | Cast iron, ductile iron, carbon steel, stainless steel, bronze |
| Sizes | DN15 to DN600 (1/2 inch to 24 inch) |
| Standards | BS EN 1171 (cast iron), BS EN 12516 (steel), API 600/603 |
What are Gate Valves?
Gate valves are quarter-turn valves that control the flow of fluids by raising or lowering a gate to open or close the valve. They're often used in low-pressure systems and for isolating sections of pipe rather than throttling flow.Types and variants
Gate valves come in several types, each suited for specific applications:- Rising Stem Gate Valve: The stem rises as you open the valve, allowing visual confirmation of its position.
- Non-Rising Stem Gate Valve: The stem doesn't rise; it rotates within a stationary nut to operate the gate. Commonly used in corrosive environments.
- Wedge Gate Valve: Features a resilient wedge that conforms to the seat for tight sealing under low pressure and temperatures up to 350°C.
- Parallel Slide Gate Valve: Has two parallel seats with a rectangular-shaped disc that slides into position when closed, suitable for high-pressure systems.
- Knife Gate Valve: Designed for slurries and semi-solid materials. The knife edge cuts through the material, sealing it effectively.
Materials and specifications
Gate valves are typically made from various materials to suit different environments:- Cast iron (BS EN 1171) is economical but limited in temperature ranges.
- Ductile iron provides better mechanical strength compared to cast iron.
- Carbon steel (EN8) offers durability at higher pressures and temperatures up to 450°C.
- Stainless steel (A2-70) resists corrosion, ideal for harsh chemical environments.
- Bronze valves are used in water treatment plants due to their excellent resistance to corrosion.
Selection criteria
Choosing the right gate valve depends on several factors:- Pressure Rating: Ensure the valve can handle the maximum system pressure. For example, API 603 specifies ratings up to 25 bar for smaller valves.
- Temperature Range: Check that the material can withstand operating temperatures without failing or degrading.
- Size (DN): Gate valves are available in sizes from DN15 to DN600, matching pipe diameters precisely.
- Flow Characteristics: Ensure the valve isn't used for throttling flow, as this can cause excessive wear and damage.
UK suppliers
MLC lists verified gate valve suppliers registered with Companies House. You'll find a range of options from major manufacturers like Cameron and Valtek, as well as local fabricators who specialise in custom designs. Suppliers adhere to the British Standards Institution (BSI) guidelines for quality and safety.Common applications
Gate valves are widely used across various industries:- Water Treatment: Knife gate valves manage slurries and semi-solid materials efficiently.
- Petroleum Refining: High-pressure parallel slide gate valves control flow in high-pressure systems.
- Chemical Processing: Stainless steel wedge gate valves resist corrosion from harsh chemicals.
- Power Generation: Carbon steel rising stem gate valves isolate sections of pipe for maintenance.
Gate valves are critical components for isolating and controlling fluid flow, but their specific application depends on the material and design chosen. Proper selection ensures reliable performance and longevity in demanding conditions.
References
Verified UK Suppliers
| Company | Company No. | Location |
|---|---|---|
| Hayward Tyler Limited | 03450138 | 1 Kimpton Road, Luton, Bedfordshire, LU1 3LD |
| Fohen Limited | 11858967 | Fourth Floor Abbots House, Abbey Street, Reading, |
| Tmh Trading Limited | 11493534 | 2 Michaels Court Hanney Road, Southmoor, Abingdon, |
| Rotaflow Fv Limited | 01851533 | Rotec House, Bingswood Ind. Est., Whaley Bridge, H |
| Rotaflow Group Limited | 08368595 | Rotec House Bingswood Trading Estate, Whaley Bridg |
Frequently Asked Questions
What are Gate Valves?
Gate Valves are engineering components used in industrial applications. Browse verified UK suppliers on MLC.
Where can I buy Gate Valves in the UK?
MLC lists verified UK gate valves suppliers with Companies House data. Browse by product category or search by location.
What are Gate Valves and what makes them suitable for low-pressure systems?
Gate valves control fluid flow by raising or lowering a gate to open or close the valve. They're ideal for low-pressure systems because they provide a full bore opening that ensures minimal resistance to flow, making them efficient for isolating sections of pipe without throttling.
What types of materials can be used in manufacturing Gate Valves?
Common materials include cast iron, ductile iron, carbon steel, stainless steel, and bronze. The choice depends on the application's pressure, temperature, and corrosive environment requirements.
How do you choose between a rising stem and non-rising stem type of Gate Valve?
For applications requiring visual confirmation of valve position, a rising stem gate valve is preferred as it visibly rises with each turn of the handwheel. Non-rising stem valves are better suited for environments where corrosion might affect the operation or visibility of the stem.
What standards should be considered when selecting Gate Valves in the UK?
Key standards include BS EN 1171 (cast iron), BS EN 12516 (steel), and API 600/603, ensuring compliance with safety and performance requirements for gate valves.
What sizes are available for Gate Valves and what applications do they serve?
Available sizes range from DN15 to DN600 (1/2 inch to 24 inches). Larger sizes are typically used in industrial applications where significant flow control is required, while smaller sizes may be suitable for residential or commercial systems.
Where can UK engineers find suppliers of Gate Valves that meet industry standards?
Engineers should look for suppliers certified under BS EN and API standards. Major engineering supply chains and distributors carry a range of gate valves from reputable manufacturers.
How do the costs vary among different materials used in manufacturing Gate Valves, and what affects their availability?
Costs can vary significantly; stainless steel gate valves are more expensive than carbon or cast iron due to material properties that enhance durability against corrosion. Availability may depend on local supply chains and demand for specific sizes and standards.
What are the main differences between wedge and parallel slide types of Gate Valves?
Wedge gate valves have a resilient wedge-shaped seat that conforms to the valve's body, providing excellent sealing ability under various conditions. Parallel slide gate valves feature two flat seats with a sliding gate, which simplifies manufacturing but may be less effective in high-pressure applications.