Here are summarized different types of products united by a common function - monitoring the ongoing flow in systems where work requires regular suspension and renewal of debit filing. Electromagnetic valves with a choice of coil voltage is applied to different work environment - water, steam, gas, petroleum products, aggressive fluid and others. Piston valves with pneumatic actuation performance in stainless steel successfully decision where are combined requirements for corrosion resistance, toughness, high temperature and purity of the fluid. Pneumatic or electric powered provide reliable remote control stop armature. They are universal design for gate, butterfly and spherical cranes.