Product Description
Non - Rising Stem Resilient Wedge Gate Valve Product Details
1. Product Overview
The Non - Rising Stem Resilient Wedge Gate Valve is a crucial component in pipeline systems for controlling the flow of various fluids. It is designed to provide a reliable on - off function, ensuring the safe and efficient operation of pipelines in different industries.
2. Working Principle
In this type of valve, the stem rotates to open and close the gate. However, unlike rising stem gate valves, the stem does not move vertically as it turns. When the stem is rotated in one direction, the resilient wedge - shaped gate moves perpendicular to the flow direction of the fluid. As the gate is lowered, it presses against the valve seat, creating a tight seal to stop the flow. Conversely, rotating the stem in the opposite direction raises the gate, allowing the fluid to flow through the valve.
3. Structural Features
3.1 Valve Body and Cover
- Materials: The valve body and cover are commonly made of cast iron or ductile iron. These materials offer high strength and good corrosion resistance, making them suitable for a wide range of applications. For example, in water supply and sewage treatment systems, the durability of these materials ensures a long - service life.
- Coatings: To further enhance corrosion protection, the inner and outer surfaces of the valve body and cover are often coated with epoxy resin. The thickness of the epoxy resin coating is typically ≥ 250 microns, providing a strong barrier against rust and other forms of corrosion.
3.2 Resilient Wedge Gate
- Construction: The wedge - shaped gate is usually made of ductile iron and is covered with a layer of resilient material, such as EPDM (ethylene - propylene - diene - monomer) rubber. The EPDM rubber not only provides excellent sealing performance but also has good resistance to abrasion and a wide temperature range.
- Sealing Mechanism: The resilient nature of the rubber on the gate allows it to conform to the shape of the valve seat, even if there are minor irregularities. This results in a tight seal, minimizing fluid leakage. The gate is designed to be self - cleaning, as it scrapes against the valve seat during operation, removing any debris or particles that may have accumulated.
3.3 Stem and Sealing
- Stem Material: The stem is commonly made of stainless steel or bronze. Stainless steel, such as ASTM A 276 UNS S43100, offers high strength and corrosion resistance, while bronze, like ASTM B 150 UNS C61400, provides good wear resistance and is suitable for applications where low friction is required.
- Sealing Arrangement: To prevent leakage around the stem, multiple sealing methods are employed. Usually, there are three O - rings installed around the stem. These O - rings not only seal the gap between the stem and the valve body but also protect the upper part of the stem from impurities entering from the waterway. This design ensures smooth operation of the stem and a long - lasting seal.
4. Technical Specifications
4.1 Pressure Rating
- Working Pressure: The valve is designed to operate under different pressure conditions. Common pressure ratings include PN10 and PN16 bar, which are suitable for a variety of pipeline systems, from low - pressure water supply networks to moderately high - pressure industrial pipelines.
- Hydrostatic Test Pressure: To ensure the integrity of the valve, it undergoes a hydrostatic test at a pressure significantly higher than the working pressure. For example, some valves may have a hydrostatic test pressure of 500 psi (pounds per square inch), which is approximately 34.5 bar. This test helps to detect any potential leaks or weaknesses in the valve structure.
4.2 Size Range
- Nominal Diameter: The Non - Rising Stem Resilient Wedge Gate Valve is available in a wide range of sizes. The nominal diameter typically ranges from 2″ to 32″ (DN50 - 800 mm). This variety in sizes allows the valve to be used in pipelines of different diameters, from small - scale residential plumbing systems to large - scale industrial and municipal pipelines.
4.3 Temperature Range
- Applicable Temperature: The valve can operate within a specific temperature range. Generally, it is suitable for temperatures from 0 °C to + 80 °C. This temperature range makes it suitable for applications involving water, certain oils, and other non - corrosive fluids within this temperature spectrum. However, for applications with higher or lower temperatures, special materials or designs may be required.
4.4 Connection Types
- Flange Connection: The most common connection type is flange connection. The flanged ends of the valve comply with international standards such as ISO 7005 - 2, EN 1092 - 2, and DIN 2501 PN 10/PN 16. This standardization ensures easy installation and compatibility with other pipeline components.
- Other Options: In addition to flange connections, some valves may also be available with grooved end connections, which are convenient for use in certain types of piping systems, especially those where quick installation and disassembly are required.
5. Product Advantages
5.1 Compact Design
- Space - Saving: The non - rising stem design of this valve makes it particularly suitable for applications where space is limited. In comparison to rising stem gate valves, which require additional vertical space for the stem to move up and down, the non - rising stem design allows the valve to be installed in areas with restricted headroom, such as underground pipelines or in equipment with tight interior spaces.
- Easy Installation: The compact size of the non - rising stem valve also simplifies the installation process. It requires less space for maneuvering during installation, reducing the overall installation time and cost.
5.2 Good Sealing Performance
- Resilient Sealing Element: The use of a resilient wedge gate, typically covered with EPDM rubber, provides excellent sealing performance. The rubber can adapt to minor irregularities in the valve seat, ensuring a tight seal even under varying pressure conditions. This results in minimal fluid leakage, which is crucial for maintaining the efficiency of the pipeline system and preventing environmental contamination.
- Long - Lasting Seal: The self - cleaning action of the gate, as it moves against the valve seat during operation, helps to keep the sealing surfaces clean and free from debris. This, combined with the durability of the rubber material, ensures a long - lasting seal, reducing the need for frequent maintenance and replacement.
5.3 Low Operating Torque
- Smooth Stem Operation: The rolled stem design, along with the use of high - quality materials for the stem and the installation of multiple O - rings, results in smooth thread edges and double - thread functionality. This design feature significantly reduces the operating torque required to open and close the valve. As a result, less force is needed to operate the valve, which is beneficial for both manual and automated operation. In manual operation, it makes the valve easier to turn, reducing operator fatigue. In automated systems, it reduces the power requirements of the actuators, leading to energy savings.
6. Application Fields
6.1 Water Supply Systems
- Municipal Water Networks: In municipal water supply systems, the Non - Rising Stem Resilient Wedge Gate Valve is used to control the flow of water from the treatment plant to the distribution network. It can be installed at various points in the pipeline, such as at the entrance of residential areas, commercial buildings, or industrial parks, to regulate the water supply and ensure its quality.
- Irrigation Systems: For agricultural irrigation systems, these valves are used to control the flow of water to the fields. They can be installed at the main supply lines or at the branch lines to distribute water to different irrigation zones. The reliable on - off function of the valve helps to ensure efficient water usage in irrigation, reducing water waste.
6.2 Wastewater and Sewage Treatment
- Treatment Plants: In wastewater and sewage treatment plants, the valve is used to control the flow of wastewater at different stages of the treatment process. It can be installed in the influent lines to regulate the amount of wastewater entering the treatment plant, as well as in the effluent lines to control the discharge of treated water. The corrosion - resistant materials of the valve make it suitable for use in the harsh environment of wastewater treatment.
- Sewer Networks: In sewer networks, the valve can be used to isolate sections of the pipeline for maintenance or repair. Its ability to provide a tight seal helps to prevent the leakage of sewage, protecting the environment and public health.
6.3 Industrial Applications
- Power Plants: In power plants, whether they are coal - fired, gas - fired, or nuclear, the Non - Rising Stem Resilient Wedge Gate Valve is used in various water - related systems. For example, in the cooling water system, the valve is used to control the flow of water to the condensers, ensuring efficient heat transfer. In the boiler feedwater system, it can be used to regulate the water supply to the boilers.
- Chemical and Petrochemical Industries: In the chemical and petrochemical industries, where the transportation of various fluids is common, these valves are used to control the flow of non - corrosive and some corrosive fluids. The corrosion - resistant coatings and materials of the valve make it suitable for use in these industries, where the quality and reliability of the valves are crucial for safe and efficient operation.
7. Standards Compliance
The Non - Rising Stem Resilient Wedge Gate Valve is designed and manufactured in accordance with international standards to ensure its quality and compatibility with different pipeline systems.
- Design and Manufacturing Standards: Standards such as EN 1171, EN 1074, DIN 3202 - F4/F5, and BS 5163 are followed during the design and manufacturing process. These standards specify requirements for the materials, dimensions, and performance of the valve.
- Inspection and Testing Standards: The valve undergoes strict inspection and testing procedures in accordance with EN 12266 - 1. This standard ensures that the valve meets the required quality and safety levels before it is released for use. The testing includes hydrostatic testing, leakage testing, and operational testing to verify the proper functioning of the valve.
8. Installation and Maintenance
8.1 Installation
- Location Selection: When installing the valve, it is important to select a location that is easily accessible for operation and maintenance. The valve should be installed in a straight section of the pipeline, away from any bends or obstructions that could affect the flow of the fluid or the operation of the valve.
- Connection Installation: For flange - connected valves, ensure that the flanges are properly aligned and the bolts are tightened evenly to prevent leakage. Follow the relevant flange connection standards, such as those mentioned above, to ensure a secure and leak - free connection.
- Orientation: The valve should be installed in the correct orientation, with the flow direction arrow on the valve body matching the actual flow direction of the fluid in the pipeline. Incorrect orientation can lead to improper operation and reduced performance of the valve.
8.2 Maintenance
- Regular Inspection: Regularly inspect the valve for any signs of leakage, damage to the gate or valve seat, or abnormal operation. Check the stem for smooth rotation and the O - rings for signs of wear or damage. If any issues are detected, take appropriate measures for repair or replacement.
- Lubrication: Lubricate the stem and other moving parts of the valve periodically to ensure smooth operation. Use a suitable lubricant that is compatible with the materials of the valve and the fluid being transported.
- Seal Replacement: Over time, the resilient seal on the gate may wear out. When this occurs, the seal should be replaced promptly to maintain the sealing performance of the valve. Follow the manufacturer's instructions for seal replacement to ensure proper installation.
Packaging & Shipping
Company Profile
Rooted in a legacy of excellence, Tianjin Auswell Valve Co., Ltd. proudly adheres to a multitude of international standards including those from China, Germany, Britain, America, Japan, and Australia. Our versatile range spans nominal diameters from DN15 to DN3000, pressure classes from 0.60 Mpa to 6.4 Mpa, and is capable of operating within temperatures from -20°C to 150°C. With a rich palette of materials like gray cast iron, ductile iron, cast steel, stainless steel, and duplex steel, our repertoire includes precision-crafted soft-sealed butterfly valves, soft-sealed gate valves, check valves, filters, ball valves, globe valves, balance valves, and diaphragm valves.
Driven by a relentless pursuit of perfection, Tianjin Auswell Valve Co., Ltd. has significantly bolstered its management framework in recent years to meet and anticipate our clients' needs. We've proudly garnered the prestigious ISO9001 Quality Management System Certification and the esteemed British WARS Drinking Water Certification. Our product offerings, celebrated for their reliability, have made their mark across Europe, Asia, Africa, and beyond, earning widespread acclaim and trust from our clientele. Upholding our commitment to quality, we at Auswell Valve Co., Ltd. are eager to collaborate fully with peers in the valve industry. Together, we strive to elevate Chinese craftsmanship onto the global stage.
Tianjin Auswell Valve Co., Ltd. It is nestled in a storied historical town in China, a place celebrated for its rich military legacy and famed for its rice cultivation. Industrial Park, Xiaozhan Town, Jinnan District, Tianjin. Here, our company boasts comprehensive production capabilities, from innovative product design and precise mold manufacturing to advanced machining, meticulous rubber smelting, epoxy spraying, and rigorous valve assembly and testing.
With state-of-the-art processing equipment and exquisite craftsmanship, we assure that every product aligns with national or international standards, reflecting our commitment to excellence. Our dedication to superior craftsmanship ensures that we deliver only the highest quality products to our valued customers.
Rooted in a legacy of excellence, Tianjin Auswell Valve Co., Ltd. proudly adheres to a multitude of international standards including those from China, Germany, Britain, America, Japan, and Australia. Our versatile range spans nominal diameters from DN15 to DN3000, pressure classes from 0.60 Mpa to 6.4 Mpa, and is capable of operating within temperatures from -20°C to 150°C. With a rich palette of materials like gray cast iron, ductile iron, cast steel, stainless steel, and duplex steel, our repertoire includes precision-crafted soft-sealed butterfly valves, soft-sealed gate valves, check valves, filters, ball valves, globe valves, balance valves, and diaphragm valves.
Rooted in a legacy of excellence, Tianjin Auswell Valve Co., Ltd. proudly adheres to a multitude of international standards including those from China, Germany, Britain, America, Japan, and Australia. Our versatile range spans nominal diameters from DN15 to DN3000, pressure classes from 0.60 Mpa to 6.4 Mpa, and is capable of operating within temperatures from -20°C to 150°C. With a rich palette of materials like gray cast iron, ductile iron, cast steel, stainless steel, and duplex steel, our repertoire includes precision-crafted soft-sealed butterfly valves, soft-sealed gate valves, check valves, filters, ball valves, globe valves, balance valves, and diaphragm valves.
Driven by a relentless pursuit of perfection, Tianjin Auswell Valve Co., Ltd. has significantly bolstered its management framework in recent years to meet and anticipate our clients' needs. We've proudly garnered the prestigious ISO9001 Quality Management System Certification and the esteemed British WARS Drinking Water Certification. Our product offerings, celebrated for their reliability, have made their mark across Europe, Asia, Africa, and beyond, earning widespread acclaim and trust from our clientele. Upholding our commitment to quality, we at Auswell Valve Co., Ltd. are eager to collaborate fully with peers in the valve industry. Together, we strive to elevate Chinese craftsmanship onto the global stage.
After Sales Service
Our advantage :Hoswell valve company distinguishes itself with a comprehensive set of strengths. We possess in - house independent R & D capabilities, backed by state - of - the - art processing equipment. Our manufacturing processes adhere to industry - leading standards, and we operate a rigorous quality control system.
Product Quality Assurance
Quality Commitment and Inspection: Before leaving the factory, valves need to undergo strict quality inspections, such as pressure tests, sealing tests, etc. It is ensured that there are no casting defects like sand holes or air holes in the valves, and there are no bruises or scratches on the flange sealing surfaces. The markings of flow rate, direction, nominal pressure, diameter, material, etc. are clear and complete. It is promised that the valves are produced and inspected in accordance with national standards, and unqualified products will not leave the factory.
Warranty Period Service: Provide a certain period of warranty service. During the warranty period, for malfunctions caused by product quality problems, the manufacturer will repair or replace parts free of charge.
Technical Support
Pre-sales Consultation: Before customers purchase valves, provide them with professional technical consultations, including suggestions on product selection, specification parameters, material characteristics, applicable working conditions, etc., to help customers choose the most suitable valve products.
Installation Guidance: Provide installation guidance services, which can be carried out online (such as by phone, video, installation manuals, etc.) or offline (by sending technicians to the site) to ensure that the valves are installed correctly and avoid problems caused by improper installation.
Usage Training: Provide usage training for customer operators, enabling them to be familiar with the operation methods of the valves, key maintenance points, knowledge of troubleshooting common faults, etc., and improving the customers' ability to use and maintain the valves.
Supply of Maintenance Parts: Ensure the timely supply of maintenance parts. For the damage of parts outside the warranty period, provide the parts at a reasonable price (such as the cost price).
Regular Follow-up Visits: Regularly conduct follow-up visits to customers, understand the usage situation of the valves, and collect customers' feedback opinions, so as to improve the products and services.
FAQ
1) Q: Are you a manufacturer or trading company?
A: Hoswell Valve is a professional valve manufacturer with experienced R&D team.
2) Q: Do you have any agent or representative abroad?
A: Yes, we have agents in some countries, they can offer local service for you.
3) Q: What kinds of valve can you supply?
A: We can supply butterfly valve, ball valve, check valve and so on.
4) Q: Do you have any certificate for the valves?
A: Yes, we have CE, BV, ATEX, TS and so on.
5) Q: What's the delivery time?
A: If all the parts of the valve are ready in stock, the valves can be delivered within 7~10 days.
6) Q: What are the countries or regions you supply valves?
A: Hoswell valves have been supplied to USA, Europe, Australia, Singapore, South Africa and so on.
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