TD56-2 Differential Pressure Controller

The Clorius TD56-2 differential pressure controller is a self-acting unit consisting of a valve with pressure balanced cone. 1, 2 or 3 springs. Diaphragm housing. One capillary tube on each side of the actuator diaphragm housing.

This Clorius TD56-2 pressure controller is designed for controlling differential pressure in individual users circuits and sub-mains within a large distribution network. For instance, in district heating or group heating networks. Control of by-pass between flow and return where 3-way valves or 2-way zone control valves are installed to limit volume variations and maximum ∆p. Similarly for low water content boilers and devices requiring a minimum circulation irrespective of load conditions.

Function

The medium flows through the free area between the seat and cone in the direction indicated by the arrow on the body. The high-pressure line is connected to the diaphragm housing via C1 and the low-pressure line to the diaphragm housing via C2. Any change of differential pressure across the diaphragm connected to the valve mechanism – above or below the setpoint-will cause the diaphragm to change its position.

If higher than the set pressure, the valve will move to close. If lower than the set pressure, the valve will move to open until the system is again balanced. Adjustment of the differential pressure setting is made by rotating the setpoint adjuster clockwise or anticlockwise until the desired set point is reached. The valve cone is pressure balanced. The pressure acts onto the bottom and top surface of the cone at the same time. In this way, the forces produced by the media are compensated.

Design

The TD56-2 differential pressure control valve is a self-acting unit consisting of a valve, springs, an actuator and two capillary tubes connected on the upper and lower side of the actuator. The valve body is made of nodular cast iron. The seat and cone are made of stainless steel. The diaphragm is made of EPDM or NBR rubber, depending on the medium to be controlled.