Abstract: The invention relates to a thermostat unit adapted to be attached to a radiator valve of the type having a rotatable adjusting spindle and a surrounding ring shaped housing portion. The thermostat has a rotary knob unit with a body portion and a smaller diameter neck portion which connects to the valve spindle. The thermostat has a base unit with a supporting ring portion which surrounds said rotary knob body portion and a tightening ring portion which is attachable to the valve housing. The base unit supporting ring portion provides lateral or transverse support for the knob unit body portion to prevent breaking thereof when the knob unit body portion is subjected to large transverse forces resulting from accidental blows to which the knob unit body portion may be subjected.

Abstract: The invention relates to a manually setable, knob-type thermostatic control assembly for radiator valves. The knob normally has a fixed or usual setting to provide a desired temperature for a room. Occasionally the setting is temporarily changed for one reason or another and the unit must be reset to its usual setting. This is facilitated herein and in the prior art by providing index markings on the relatively rotatable members. The novelty herein, however, is in providing a cap for the rotatable knob member which carries the index marking and the cap is readily adjustable relative to rotatable member in a simple manner without detaching the cap from the knob member.