Forespar Ball Valves
When it comes to marine plumbing solutions that combine exceptional durability with corrosion-free performance, Forespar has established itself as an industry leader through its innovative Marelon composite ball valves. For boaters and marine professionals seeking reliable water flow control in the harsh saltwater environment, Forespar's specialized valve offerings deliver engineering excellence that has made them a trusted choice among production boat builders and retrofit applications alike.
Marelon Material Innovation
Forespar's MF 850 series of Ball Valves are precision molded in high strength glass-reinforced Marelon, a proprietary polymer composite that fundamentally addresses the chronic corrosion and electrolysis problems that plague traditional bronze marine fittings. Great strength, light weight, easy installation and maintenance as well as freedom from corrosion and electrolysis creates the ideal valve for controlling inlet and outlet water flow above and below the waterline. The material's temperature range spans from -40°F to +176°F, making these valves reliable across every climate and season—from Arctic expeditions to tropical cruising grounds.
Rigorous Testing and Proven Reliability
Forespar backs its ball valve designs with stringent quality assurance protocols that exceed industry expectations. Forespar engineers opened and closed one of their 3/4" valves 11,000 times, then submerged it in water with an air line pressurized to 40psi connected to it. The result was an absolutely leak free condition with no evidence of internal seal wear. This level of durability testing demonstrates why marine surveyors and insurance companies increasingly recognize Marelon valves as meeting or exceeding UL and ABYC standards for below-waterline applications.
Comprehensive Product Line
Forespar offers two primary ball valve series to address different installation requirements. The MF 850 series serves as the workhorse for general marine plumbing applications, while the 93 Series valves are designed and engineered for builders, boat yards and owners who require the benefits of the high-strength glass reinforced Marelon Integrated Plumbing System with "standard" female threads. All "93" series valves are full port (the Inside Diameter of the ball is the same as the I.D of the barb), ensuring maximum flow rates without restriction—a critical consideration for engine cooling systems and high-volume bilge applications.
Installation Flexibility and Compatibility
Understanding that marine retrofits often involve working with existing bronze or stainless steel components, Forespar ball valves feature NPSM (National Standard Free-Fitting Straight Mechanical Pipe Thread) threading that allows integration with diverse plumbing systems. The valves can be sealed using standard Teflon tape or marine sealants, and installation follows the same procedures used for traditional metal fittings. For production builders, Forespar provides extensive configuration options including straight tailpipes, 90-degree elbows, and various thread specifications to streamline installation and reduce labor costs.
Whether you're upgrading aging bronze seacocks to eliminate corrosion concerns, building a new vessel with a complete Marelon plumbing system, or simply replacing a failed valve, Forespar ball valves represent a proven solution that combines lightweight construction with decades of marine engineering expertise.