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Features and benefits. Velan pressure seal y-pattern globe valves offer lower and higher Cvs. Velan's proven pressure seal design. Low pressure drop Velan IOMs offer comprehensive instructions on installing and maintaining your Velan valves. Bellows seal bolted bonnet high pressure valves (large forged). simple maintenance, ease of operation, and above all, long and reliable . Velan HP/HT Pressure Seal & Bolted Bonnet Valves are used in a broad range of Features and benefits. 0 Stronger, leakproof bolted body bonnet joint ensures joint tightness with a higher bolting torque. 0 Body guided disc eliminates side Features and benefits. Velan's proven pressure seal design. No penetration of hinge pin to outside eliminating possibility of pin seal leakage and allowing for Installation of Disc in Parallel Slide Valves. Testing a 24” Pressure Seal Valve. Please note this is a condensed catalog. For a complete version, contact Velan Consult VELAN's entire Pressure Seal and Bolted Bonnet Valves catalogue on This is only practical in manual valves or electronically controlled motorA complete range of gate, globe, and check valves for all of your high pressure and high temperature applications, proven over years of service in conventional Velan pressure seal flexible wedge gate valves are ideal for high pressure steam (main steam isolation), liquid (feedwater isolation), catalytic reformers,