The best choice for the toughest applications Solving your most demanding control valve application - this has been the single, driving force behind RKL Controls and its parent company, Red Valve Company., Inc. Today we r......The best choice for the toughest applications Solving your most demanding control valve application - this has been the single, driving force behind RKL Controls and its parent company, Red Valve Company., Inc. Today we remain deticated to responding to your needs with control valve products and engineering services that set the standard for the toughest applications. RKL representatives stand by ready to work with you to solve your toughest control applications.