We have a plazma cutting machine for slicing the spiral pipe. The electric connections and all the circuits are completed, but the cooling system for the torch, providing much problem. we have changed many pumps increasing the power of motor. Then too we can't solve the problem. The problem the pressure from the pump releases the relief valve (more pressure,but it is in design pressure, 5lpm, 200psi). Though we maintain flow, we can't maintain the pressure (increases). So please help me to solve this.