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Fort Vale improves Sealtyt
Originally published:  19/09/2011
The range of Fort Vale 4” 90° and 75° pneumatically and hydraulically operated Sealtyt discharge valves is now compliant with the requirements of BS EN14433:2006 (Tanks for the transport of dangerous goods – Tank equipment for the transport of liquid chemicals – Footvalves). In addition, the manufacturer reports, recent product development has resulted in the valve offering the user improved flow rates.
The 4” Sealtyt footvalve was launched to meet the demanding requirements of general- purpose liquid road tankers, and especially for cargoes with high viscosity. A spring load of 1,500 N when closed to 3,550 N fully open is exerted onto the poppet, which allows the valve to break any crystallised product that may have accumulated around the sealing face. Lighter spring loads are available for use with non-crystallising products.
Safety and failsafe features are paramount as well as convenience and ease of maintenance, and the 4” Sealtyt offers several unique features. For maximum cargo compatibility and resilience, the valve is fitted with a PTFE main seal with elastomer core. The seal-retaining plate design eliminates the possibility of a leak path and ensures clean valve internal lines. Alternative seal materials with higher temperature capabilities are available if required. The main seal can quickly and easily be replaced without the need to decompress the spring. The sealing poppet is guided through the bayonet cap which eliminates the risk of the valve jamming open during service.
Furthermore, the spherical location of the actuator renders the poppet self-centering which increases the sealing reliability of the valve. Should the pneumatic/hydraulic supply fail, the valve may be manually operated using the emergency jacking point. An innovative spindle sealing system uses metal-energised PTFE O rings which offer cost and reliability advantages over typically used chevron seals, particularly at lower and higher temperatures.
The Fort Vale 4” Sealtyt footvalve has an industry standard inlet drilling and TW100 outlet flange drilling, making it compatible and interchangeable with similar units in the market. The valve is available with alternative body configurations and outlet flange drilling patterns. Standard consumable spare parts are widely available worldwide. Fort Vale can supply a range of EN Norm approved secondary closure valves to suit.