Liquid Silicone One-Way Valve Seat Gasket

# Liquid Silicone One-Way Valve Seat Gasket

*Manufactured by Xiangchu (Hubei) Rubber Co., Ltd.*

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Product Overview

Liquid Silicone One-Way Valve Seat Gasket is a precision-molded sealing component designed exclusively for one-way valve assemblies, engineered to control unidirectional fluid flow while maintaining consistent, leak-proof sealing between valve components. As a core liquid silicone rubber (LSR) product of Xiangchu (Hubei) Rubber Co., Ltd. (located at No. 54, Neihe Lane, Fankou Sub-district, Echeng District Economic Development Zone, Ezhou City, Hubei Province, China), this gasket is manufactured through high-precision injection molding of food-grade and medical-grade liquid silicone rubber, delivering superior elasticity, compression resistance, and chemical inertness unmatched by traditional rubber gasket materials.

This product functions as both a sealing interface and a flow-regulating auxiliary component in one-way valve systems: it fills the gap between the valve seat and valve body to prevent external fluid leakage or internal cross-flow, and provides consistent rebound force to support the one-way valve flapper in closing tightly after flow reversal. Our LSR one-way valve seat gasket maintains stable performance across a wide temperature range, resists long-term fatigue from repeated compression and rebound cycles, and complies with global regulatory requirements for food contact and medical applications, making it suitable for a wide range of industrial, consumer, and healthcare use cases.

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Technical Specifications

Material Properties

Our one-way valve seat gaskets are produced from 100% pure, low-volatile platinum-cured liquid silicone rubber, with the following core material properties:

Physical Performance

Finished gaskets are tested to meet the following physical performance standards before delivery:

Process Parameters

All our one-way valve seat gaskets are manufactured via precision liquid silicone injection molding, with controlled production parameters to ensure dimensional consistency:

• Molding Temperature: 160°C ~ 180°C
• Molding Pressure: 8 ~ 12 MPa
• Dimensional Tolerance: ±0.05 mm for dimensions ≤10 mm; ±0.1 mm for dimensions 10~50 mm (tighter tolerances available on request)
• Surface Finish: Smooth matte finish, no flash, burrs, or visible molding defects
• Post-Curing: 4 hours @ 150°C to remove residual volatile compounds

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Product Advantages

1. Outstanding Fatigue Resistance for Long Service Life

Unlike conventional nitrile rubber (NBR) or ethylene propylene diene monomer (EPDM) gaskets, our LSR one-way valve seat gaskets maintain stable elasticity and rebound performance after millions of compression and opening cycles. The low compression set characteristic of high-quality LSR prevents permanent deformation of the gasket after extended use, which avoids leakage caused by an inconsistent sealing surface, extending the overall service life of the entire one-way valve assembly.

1. Regulatory-Compliant Material Purity for Sensitive Applications

All raw materials used in our gaskets are sourced from established global silicone suppliers, and we use only platinum-cured cross-linking systems (avoiding toxic peroxide curing agents common in lower-cost silicone products). The finished product meets international food contact standards, with no residual odor or harmful extractables, making it suitable for use in drinking water systems, food processing equipment, and medical devices.

1. Customizable Design Precision Driven by LSR Injection Molding

Liquid silicone injection molding enables high repeatability and precision for complex gasket geometries, from thin 0.3 mm gaskets for miniature valves to thick 10 mm gaskets for industrial large-flow valves. We can customize dimensional specifications, hardness, and surface treatment according to customer design requirements, ensuring a perfect fit for your valve assembly without additional secondary machining.

1. Wide Temperature and Chemical Compatibility

Our LSR gaskets retain their elasticity and sealing performance even in extreme low-temperature environments down to -40°C, and do not age or harden in continuous high-temperature environments up to 200°C. This broad temperature compatibility makes our product suitable for applications ranging from frozen food processing equipment to automotive engine fluid systems that require exposure to high heat. The inherent chemical inertness of silicone also resists degradation from water, common detergents, and physiological fluids, maintaining sealing performance in long-term contact.

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Applications

Liquid Silicone One-Way Valve Seat Gaskets from Xiangchu (Hubei) Rubber Co., Ltd. are used in a wide range of industries, including:

1. Household Water Treatment & Appliances: Used in one-way valves for reverse osmosis water purifiers, drinking water fountains, and instantaneous water heaters, providing leak-proof sealing and safe contact with potable water.
2. Medical Devices & Pharmaceutical Equipment: Applied to one-way valve assemblies in infusion sets, breathing circuits, negative pressure wound therapy devices, and pharmaceutical peristaltic pump systems, where biocompatible, low-volatility materials are required.
3. Food & Beverage Processing Equipment: Suitable for one-way valves in beverage dispensers, coffee machines, food filling lines, and dairy processing equipment, with material properties that comply with food contact requirements and resist repeated high-temperature sterilization.
4. Automotive Systems: Used in automotive fuel system vent valves, cooling system one-way valves, and brake system vacuum control valves, leveraging the product's high and low temperature resistance and oil resistance for stable performance in under-hood environments.
5. Industrial Fluid Control: Applied to compressed air pipelines, water treatment system valve assemblies, and medical gas delivery systems, providing reliable unidirectional flow control and long-term leak-proof sealing.

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Selection Guide

Hardness Selection

Hardness selection depends on the pressure range and rebound requirements of your one-way valve assembly:

• 30~40 Shore A: Soft grade, suitable for low-pressure fluid systems (<0.1 MPa), provides good conformability to irregular sealing surfaces for enhanced leak-proof performance.
• 40~60 Shore A: General-purpose medium grade, suitable for most conventional fluid control systems (0.1~1.0 MPa), balances conformability and rebound force for consistent long-term performance.
• 60~70 Shore A: Hard grade, suitable for high-pressure systems (>1.0 MPa), provides high structural rigidity to avoid gasket deformation under high pressure.

Size Specifications

We produce standard and custom sized gaskets to match common one-way valve specifications:

• Common outer diameter range: 5 mm ~ 200 mm, with thickness options from 0.3 mm ~ 10 mm.
• Customers can provide detailed 2D drawings or 3D model files for customized sizes and special geometries (including notches, positioning holes, and stepped profiles). We maintain dimensional tolerance control aligned with international standards to ensure compatibility with existing valve assemblies.

Material Grade

We offer two standard material grades to match different application requirements:

• Industrial Grade: Suitable for general industrial fluid control systems, automotive non-critical components, and other applications with no direct human contact or food contact requirements.
• Food/Medical-Grade: Produced with higher-purity raw materials, additional post-curing to reduce volatile content, and production processes aligned with good manufacturing practices (GMP) principles, suitable for drinking water, food processing, and medical device applications.

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Quality Assurance

Xiangchu (Hubei) Rubber Co., Ltd. operates a quality management system certified to ISO 9001, covering every production process from raw material incoming inspection to finished product outbound testing. Each batch of Liquid Silicone One-Way Valve Seat Gasket undergoes the following quality checks before delivery:

1. Raw material inspection: Verify material hardness, tensile strength, and purity to ensure compliance with our internal specifications.
2. Dimensional inspection: Check critical dimensions with digital calipers, micrometers, and 2D optical measurement to confirm alignment with customer requirements.
3. Appearance inspection: 100% visual inspection to eliminate products with flash, burrs, bubbles, or other molding defects.
4. Performance testing: Each batch undergoes compression set, tensile, and sealing performance testing to confirm compliance with physical performance standards.

We are committed to delivering consistent, high-quality LSR components that meet customer application requirements, and provide responsive after-sales support for all product inquiries.

For custom inquiries or bulk orders, contact us at:

• Phone: +86 18071171144
• Email: churubber@163.com
• Address: No. 54, Neihe Lane, Fankou Sub-district, Echeng District Economic Development Zone, Ezhou City, Hubei Province, China