METHOD OF OBTAINING DERIVATIVES OF DIOXYPENICILLANIC ACID

摘要

The thermostatically controlled heating valve (3) has the position of the valve stage varied to maintain a flow condition by expansion and contraction of a thermostat element that is coupled by a spindle. The set point can be changed by an actuator and allows a different temperature set point to be used at night to that of daytime. A display aperture on the body (7) shows one of two symbols for day and night (23).