Made of food-grade liquid silicone rubber, suitable for various pump and valve structures, with excellent aging resistance, corrosion resistance and temperature resistance, stable sealing performance, effectively preventing medium leakage, maintaining good performance in complex working conditions for a long time, easy to install and long service life.
Material
Food-grade LSR
Hardness
Shore A 40-70
Temperature
Certifications
Applications
-40°C ~ +230°C
Colors
Black, White, Transparent, Customizable
# Food Grade Wear-resistant Liquid Silicone Pump Valve Seal Ring
The Food Grade Wear-resistant Liquid Silicone Pump Valve Seal Ring is a high-precision sealing component manufactured via injection molding of medical and food-contact approved liquid silicone rubber (LSR), designed specifically for dynamic and static sealing applications in food, beverage, pharmaceutical, and cosmetic processing pump and valve systems. Unlike traditional rubber seals, this product combines the inherent biocompatibility of LSR with a proprietary wear-resistant formulation, delivering reliable sealing performance even under long-term cyclic operation, frequent material flushing, and wide temperature fluctuations.
Core selling points of this seal ring include compliance with global food contact safety standards, 3x longer service life than conventional silicone seals in abrasive operating conditions, low compression set to prevent leakage after extended use, and broad chemical resistance to common food ingredients, cleaning agents, and disinfectants. It is precision machined to micron-level dimensional tolerances, ensuring a perfect fit with most standard centrifugal pumps, diaphragm pumps, butterfly valves, ball valves, and check valves used in hygienic processing lines, eliminating the risk of material leakage, external contamination, and product spoilage.
The seal ring is formulated with high-purity nano fumed silica and a cross-linking optimized molecular structure, reducing abrasive wear by 65% compared to conventional food-grade silicone seals. In cyclic diaphragm pump applications conveying granular food slurries (e.g., fruit juice with pulp, sauce with particle seasonings), it delivers a continuous service life of 8000+ hours, 3x longer than standard nitrile rubber (NBR) seals and 2.5x longer than ordinary LSR seals, significantly reducing maintenance frequency and unplanned production downtime.
All raw materials used in production are free of plasticizers, BPA, phthalates, and toxic heavy metals, with no low-molecular-weight substance migration even after long-term contact with acidic, alkaline, or fatty food ingredients. It is suitable for repeated high-temperature sterilization processes including 121°C moist heat autoclaving, 134°C SIP (sterilization-in-place), and 80°C CIP (cleaning-in-place) with 2% sodium hydroxide cleaning agents, maintaining stable performance without deformation or degradation, fully meeting the hygienic requirements of the food and pharmaceutical industries.
The addition-cured LSR formulation delivers excellent elastic recovery, with a compression set of less than 8% after 22 hours of compression at 70°C, far lower than the 20% limit for standard silicone seals. Even after 12 months of continuous installation in a static valve sealing position, it maintains over 90% of its original sealing interference, eliminating the risk of medium leakage or external microbial ingress that often occurs with traditional seals after prolonged compression.
This seal ring is resistant to most common food and beverage ingredients including ethanol (up to 20% concentration), citric acid, lactic acid, vegetable oils, and salt solutions, as well as common disinfectants such as peracetic acid, hydrogen peroxide, and quaternary ammonium salt disinfectants. Unlike NBR or EPDM seals, it does not swell, crack, or degrade in contact with these media, avoiding seal failure and product contamination caused by material incompatibility.
Widely used in sealing positions of centrifugal pumps, screw pumps, diaphragm pumps, butterfly valves, and ball valves in dairy, beverage, brewing, and condiment production lines. It is suitable for conveying milk, fruit juice, beer, sauce, edible oil, and other food media, with no impact on product taste or color, and meets the hygiene requirements of aseptic cold filling production processes.
Suitable for sealing of liquid delivery pumps and process valves in pharmaceutical oral liquid, topical ointment, and cosmetic production lines. Its ISO 10993-5 compliant biocompatibility ensures no interaction with active pharmaceutical ingredients (APIs) or cosmetic raw materials, and it withstands repeated SIP/CIP cycles in GMP production environments.
Used in dishwashers, commercial coffee machines, beverage dispensers, and food packaging machine pump and valve systems. It maintains stable performance under frequent temperature changes between 0°C (cold beverage delivery) and 200°C (hot coffee/steam sterilization), with excellent resistance to scale and detergent corrosion.
Applicable to sealing of pump and valve systems in the production of daily chemicals, water treatment, and biopharmaceutical upstream processes that require hygienic levels, resisting long-term flushing of abrasive media such as activated carbon slurries and microbial culture media.
We implement a full-process quality control system from raw material incoming inspection to finished product delivery:
We offer a 12-month warranty from the date of delivery for all standard products. If seal failure occurs under normal operating conditions within the warranty period, we provide free replacement or a full refund, and our technical team provides on-site failure analysis and sealing solution optimization services.
