A Flanged Resilient Gate Valve is a type of gate valve that features a rubber-lined (resilient) wedge and flanged end connections. Unlike traditional metal-seated gate valves, the resilient wedge provides a tight, bubble-proof seal when the valve is closed.
This valve is operated by raising or lowering a gate (wedge) perpendicular to the flow direction. When fully open, the valve creates minimal flow resistance, making it ideal for on/off control rather than throttling.
The “flanged” design allows easy installation and disassembly between pipe flanges, ensuring secure, leak-proof connections in pipeline systems.
At WEIZIDOM, our Flanged Resilient Gate Valves are manufactured with strict quality control (12 tests from raw material to final product) and comply with international standards such as GB, DIN, AWWA, ISO, etc., making them suitable for various water system applications worldwide.
In water systems, the Flanged Resilient Gate Valve plays a critical role as a reliable shut-off and isolation device.
|
Function |
Description |
|
Flow Isolation |
Used to completely stop or allow water flow in pipelines for maintenance, repair, or emergency shutdown. |
|
Sectional Control |
Divides a large water network into manageable sections, enabling localized shutdown without affecting the entire system. |
|
Pump & Station Protection |
Installed at pump stations and reservoir outlets to protect equipment from backflow or unexpected flow surges. |
|
Pressure Management |
When fully open, it offers near-zero flow resistance, helping maintain consistent pressure in transmission mains. |
|
Safe Maintenance |
Provides a positive shut-off for safe repair of downstream components like meters, valves, or hydrants. |
✔ Municipal water supply networks
✔ Building water distribution systems
✔ Fire protection pipelines
✔ Irrigation and drainage systems
✔ Industrial water treatment plants
Key Features & Advantages
WEIZIDOM’s Flanged Resilient Gate Valves are engineered to deliver superior performance, durability, and ease of use.
Below are their standout features:
|
Feature |
Advantage |
|
100% Leak-Free Sealing |
The fully rubber-encapsulated wedge ensures a bubble-tight shut-off even under low pressure, exceeding metal-seated alternatives. |
|
Corrosion Resistance |
Ductile iron body with fusion-bonded epoxy coating (or as required) provides excellent resistance to rust, chemicals, and aggressive water conditions. |
|
Low Torque Operation |
Optimized wedge geometry and low-friction stem nut reduce operating torque, making it easy to open/close even in large diameters. |
|
Bidirectional Sealing |
Seals equally well against pressure from either direction, simplifying installation and avoiding orientation errors. |
|
Long Service Life |
Resilient rubber wedge resists abrasion, debris, and aging. With 12-step in-house testing, our valves are built for decades of reliable service. |
|
Flanged End Connection |
Standardized drilling (DIN / ANSI / ISO) allows direct bolting to mating pipe flanges. Easy to install, remove, and maintain. |
|
Rising or Non-Rising Stem Options |
Available in rising stem (visual position indicator) or non-rising stem (for underground or limited-space installations). |
|
Compliance with Global Standards |
Designed and tested to meet GB, JB, HB, ASME, API, AWWA, DIN, EU, ISO — ready for projects anywhere in the world. |
Technical Specifications (Example)
|
Parameter |
Specification |
|
Nominal Diameter (DN) |
DN40 – DN600 (larger on request) |
|
Nominal Pressure (PN) |
PN10 / PN16 / PN25 (or Class 125 / 150) |
|
Body Material |
Ductile Iron / Cast Iron |
|
Wedge Material |
Ductile Iron + EPDM/NBR Rubber Coating |
|
Stem Material |
Stainless Steel (2Cr13 / SS304 / SS316) |
|
End Connection |
Flanged (DIN / ANSI / BS / ISO) |
|
Coating |
Fusion-Bonded Epoxy (min. 250μm) |
|
Temperature Range |
-10°C to +80°C (water applications) |
What is a Hard Seal Gate Valve?
A Hard Seal Gate Valve is a type of gate valve where the sealing surfaces between the gate (wedge) and the valve body are made of metal-to-metal contact, rather than rubber or other resilient materials. Common hard seal materials include stainless steel, stellite alloy, hardfaced chrome, or other wear-resistant alloys.
The valve operates by raising or lowering a wedge-shaped gate perpendicular to the flow direction. When fully open, the gate is completely retracted from the flow path, creating minimal pressure drop. When closed, the metal sealing surfaces press tightly together to block the flow.
Unlike resilient (soft seal) gate valves, hard seal gate valves are designed for higher temperatures, higher pressures, and abrasive or corrosive media where rubber or elastomer seals would fail.
At WEIZIDOM, our Hard Seal Gate Valves are manufactured with strict quality control and comply with international standards such as GB, JB, ASME, API, AWWA, DIN, ISO, ensuring reliable performance in demanding water system environments.
Main Function in Water Systems
In water systems, the Hard Seal Gate Valve serves as a durable shut-off and isolation device for conditions where soft-seal valves are not suitable.
Its primary functions include:
|
Function |
Description |
|
High-Temperature Isolation |
Capable of handling hot water, steam, or high-temperature industrial water where rubber seals would degrade. |
|
High-Pressure Shut-Off |
Provides reliable sealing in high-pressure water mains (e.g., PN25, PN40, or Class 300+) that exceed soft-seal valve limits. |
|
Abrasive Media Handling |
Suitable for water containing sand, sediment, slurry, or other abrasive particles that could damage a resilient rubber wedge. |
|
Corrosive Water Conditions |
With appropriate alloy selection (e.g., stainless steel or duplex steel), resists corrosion from saline water, chemical-laden water, or wastewater with aggressive components. |
|
Long-Term Durability |
Metal-to-metal sealing surfaces are resistant to aging, ozone, UV radiation, and chemical attack, ensuring decades of service without seal replacement. |
Typical applications include:
✔ High-temperature water transmission
✔ High-pressure booster stations
✔ Industrial cooling water systems
✔ Raw water intake with sand/sediment
✔ Desalination plants (brine handling)
✔ Wastewater treatment (abrasive sludge lines)
✔ Power plant water circuits
Key Features & Advantages
WEIZIDOM’s Hard Seal Gate Valves are engineered for extreme conditions and demanding water system applications.
Below are their standout features:
|
Feature |
Advantage |
|
Metal-to-Metal Sealing |
Hardfaced stainless steel or alloy sealing surfaces provide excellent wear resistance and dimensional stability, even after thousands of cycles. |
|
High Temperature Capability |
Operating range from -29°C to +425°C (or higher depending on material), far exceeding soft-seal valves. |
|
High Pressure Rating |
Available up to PN40, Class 600, or higher, suitable for high-pressure water mains and industrial systems. |
|
Abrasion & Erosion Resistance |
Hardfaced wedge and seat rings (e.g., Stellite 6, hard chrome, tungsten carbide) resist damage from sand, grit, and slurry. |
|
Corrosion Resistance |
Available in carbon steel (with coating), stainless steel (SS304, SS316), duplex steel, or other alloys to match water chemistry. |
|
Bidirectional Sealing |
Seals equally well against pressure from either direction, simplifying installation. |
|
Flanged End Connection |
Standardized drilling (DIN / ANSI / ISO) allows secure, leak-proof connection to mating pipe flanges; easy to install and maintain. |
|
Rising or Non-Rising Stem Options |
Rising stem provides visual open/closed indication; non-rising stem saves space for underground or pit installations. |
|
Long Service Life |
No rubber components to crack, swell, or harden over time. With 12-step in-house testing, our valves are built for decades of reliable operation. |
|
Compliance with Global Standards |
Designed and tested to meet GB, JB, ASME, API, AWWA, DIN, ISO — suitable for projects worldwide. |
Hard Seal vs. Soft Seal (Resilient) Gate Valve – Quick Comparison
|
Parameter |
Hard Seal Gate Valve |
Soft Seal (Resilient) Gate Valve |
|
Sealing Material |
Metal-to-metal (e.g., stainless steel, Stellite) |
Rubber (EPDM/NBR) encapsulated wedge |
|
Temperature Range |
-29°C to +425°C |
-10°C to +80°C |
|
Pressure Range |
Up to PN40 / Class 600+ |
Typically PN10–PN25 |
|
Abrasion Resistance |
Excellent |
Poor (rubber can be cut/gouged) |
|
Corrosion Resistance |
Good (depends on alloy) |
Good (body coating) but rubber can degrade |
|
Leakage Rate |
Zero / minimal (metal-seated) |
Bubble-tight zero leakage |
|
Operating Torque |
Higher (metal-on-metal friction) |
Lower |
|
Ideal For |
High temp, high pressure, abrasive media |
Clean/cold water, general service |
|
Cost |
Higher |
Lower |
Note: For most standard clean water applications, a resilient (soft seal) gate valve is recommended. Choose hard seal when operating conditions exceed soft seal limits.
Technical Specifications (Example)
|
Parameter |
Specification |
|
Nominal Diameter (DN) |
DN50 – DN600 (larger on request) |
|
Nominal Pressure (PN) |
PN16 / PN25 / PN40 / Class 150 / Class 300 |
|
Body Material |
Cast Iron / Ductile Iron / Carbon Steel (WCB) / Stainless Steel (CF8, CF8M) |
|
Wedge Material |
Ductile Iron / Carbon Steel / Stainless Steel with hardfacing (Stellite, hard chrome, etc.) |
|
Seat Rings |
Stainless steel or alloy, hardfaced |
|
Stem Material |
Stainless Steel (2Cr13 / SS304 / SS316 / SS420) |
|
End Connection |
Flanged (DIN / ANSI / BS / ISO) |
|
Coating |
Fusion-Bonded Epoxy (for iron/steel bodies) |
|
Temperature Range |
-29°C to +425°C (depending on material) |
|
Applicable Media |
Clean water, raw water, hot water, steam, abrasive slurry, saline water, chemically treated water |
What is a Socket Gate Valve?
A Socket Gate Valve (also known as an Inside Screw Gate Valve or Non-Rising Stem (NRS) Gate Valve with socket ends) is a type of gate valve where the ends are designed as female threaded sockets that accept male-threaded pipes, rather than flanged or butt-welded connections.
In a socket gate valve, the stem threads are located inside the valve body, so the stem does not rise when the valve is opened or closed. This design makes it ideal for underground installation or confined spaces where vertical clearance is limited.
The valve operates by rotating the stem nut (via a square drive or handwheel), which moves the wedge (gate) up or down perpendicular to the flow direction. When fully open, the gate is completely retracted, offering minimal flow resistance.
At WEIZIDOM, our Socket Gate Valves are manufactured with strict quality control (12 tests from raw material to final product) and comply with international standards such as GB, DIN, BS, ISO, making them a reliable choice for small to medium-sized water pipeline systems.
Main Function in Water Systems
In water systems, the Socket Gate Valve serves as a compact, cost-effective shut-off and isolation device for smaller diameter pipelines.
Its primary functions include:
|
Function |
Description |
|
Flow Isolation |
Used to completely stop or allow water flow in branch lines, service connections, or small-diameter mains for maintenance or repair. |
|
Building Water Supply |
Installed at building entry points, floor distribution lines, or individual risers to isolate sections of a plumbing system. |
|
Fire Protection Systems |
Commonly used in wet pipe sprinkler systems and fire hydrant branch lines for reliable on/off control. |
|
Meter & Equipment Isolation |
Placed upstream and downstream of water meters, pressure regulators, or backflow preventers to allow safe removal or servicing. |
|
Underground Service Connections |
Non-rising stem design allows direct burial without needing large valve boxes, making it ideal for curb stops and property line shut-offs. |
|
Garden & Irrigation Systems |
Suitable for manual isolation of irrigation zones, greenhouse water lines, or landscape watering systems. |
Typical applications include:
✔ Residential and commercial building plumbing
✔ Fire sprinkler branch lines
✔ Water meter bypass and isolation
✔ Irrigation and landscape watering
✔ Underground curb stops and service connections
✔ Small-diameter municipal branch lines (≤ DN100)
✔ Industrial utility water lines
Key Features & Advantages
WEIZIDOM’s Socket Gate Valves are designed for ease of installation, space savings, and reliable performance in small to medium water systems.
Below are their standout features:
|
Feature |
Advantage |
|
Socket (Threaded) Ends |
Quick and easy connection to male-threaded steel, galvanized, brass, or PVC pipes without welding or flanges — reduces installation time and cost. |
|
Non-Rising Stem (NRS) Design |
The stem does not extend upward when opening or closing, allowing installation in pits, trenches, or other vertical-clearance-limited spaces. |
|
Compact & Lightweight |
Smaller footprint and lighter weight compared to flanged gate valves, making handling, storage, and installation easier. |
|
Leak-Free Sealing |
Resilient rubber wedge (EPDM/NBR) provides bubble-tight shut-off, meeting or exceeding industry leakage requirements. |
|
Corrosion Resistance |
Ductile iron or cast iron body with fusion-bonded epoxy coating provides excellent resistance to rust and waterborne corrosion. |
|
Low Operating Torque |
Optimized wedge geometry and low-friction stem nut make manual operation easy, even after long periods of inactivity. |
|
Bidirectional Sealing |
Seals equally well against pressure from either direction, eliminating concerns about correct valve orientation during installation. |
|
Visual Position Indicator (Optional) |
Exposed square stem top allows visual confirmation of valve position (e.g., number of turns) or connection of a handwheel/key. |
|
Multiple Material Options |
Available in cast iron, ductile iron, brass, bronze, or stainless steel to suit different water qualities and pressure requirements. |
|
Cost-Effective |
Lower material and installation cost compared to flanged gate valves, making it ideal for high-volume projects and small-diameter applications. |
|
Compliance with Global Standards |
Designed and tested to meet GB, DIN, BS, ISO, and other relevant standards for water system applications. |
Socket Gate Valve vs. Other Gate Valve Types – Quick Comparison
|
Parameter |
Socket Gate Valve (NRS) |
Flanged Gate Valve |
Resilient Gate Valve (Flanged) |
|
End Connection |
Female threaded socket |
Flanged (bolted) |
Flanged (bolted) |
|
Stem Type |
Non-rising (NRS) |
Rising or non-rising |
Rising or non-rising |
|
Installation |
Screw onto male-threaded pipe |
Bolt between flanges |
Bolt between flanges |
|
Vertical Space Required |
Very low |
High (if rising stem) |
High (if rising stem) |
|
Typical Diameter Range |
DN15 – DN100 (½” – 4″) |
DN40 – DN600+ |
DN40 – DN600+ |
|
Ideal For |
Small lines, underground, confined spaces |
Large mains, above-ground, frequent disassembly |
Large mains, low torque, bubble-tight seal |
|
Cost |
Low |
High |
Medium–High |
|
Maintenance |
Easy (unscrew from line) |
Moderate (unbolt from flanges) |
Moderate |
Technical Specifications (Example)
|
Parameter |
Specification |
|
Nominal Diameter (DN) |
DN15 – DN100 (½” – 4″) |
|
Nominal Pressure (PN) |
PN10 / PN16 / PN25 (Class 125 / 150) |
|
End Connection |
Female BSPT / NPT threaded socket (other threads available on request) |
|
Body Material |
Cast Iron / Ductile Iron / Brass / Bronze / Stainless Steel (CF8) |
|
Wedge Material |
Ductile Iron + EPDM/NBR rubber coating (soft seal) or all-metal (hard seal) |
|
Stem Material |
Brass / Stainless Steel (2Cr13 / SS304) |
|
Stem Type |
Non-rising (NRS) |
|
Coating |
Fusion-Bonded Epoxy (for iron/steel bodies) or natural (for brass/bronze) |
|
Temperature Range |
-10°C to +80°C (soft seal) / -29°C to +200°C (hard seal, optional) |
|
Applicable Media |
Cold water, hot water, air, oil, non-corrosive fluids |
|
Standards Compliance |
GB / DIN / BS / ISO / ASME (as required) |
Installation Notes
Apply thread sealant (e.g., PTFE tape or pipe joint compound) to male pipe threads before assembly.
Do not overtighten – hand-tighten plus 1–2 turns with a wrench is sufficient.
Avoid using the valve body as a lever – support the pipe properly during installation.
Install in the fully open position to prevent debris from lodging in the wedge during assembly.
For buried installation – wrap with anti-corrosion tape or provide a protective valve box if required by local codes.
