Since 1964 the PERMA/flo “XT & XL” eXTreme Rotary Valve has been considered the valve of choice by customers who demand long life, rugged durability, ease of maintenance and high quality. Both the “XL” and “XT” series of rotary valves feature a unique design that offers adjustment between the rotor and the seal shoe. This adjustability enables the rotor to seal shoe gap to be maintained providing the tightest seal possible throughout the life of the unit. Both the rotor and seal shoe are constructed of a special chrome-iron alloy called P-33. This alloy yields a hardness of 500-600 Brinell. Unlike other valves that feature a surface hardening, P-33 is a solid alloy casting that does not wear off to expose a softer metal base. Adjusting and maintaining a tight gap between the rotor & seal shoe can be made externally while the valve is in place.
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