FIELD: heating.
SUBSTANCE: valve unit (1) includes housing with inlet (2) and outlet (3), valve 1 (6) with seat (8) and gate (7) and valve 2 (10) providing stable pressure drop at valve 1 (6). Valve 1 (6) is located in the first part of unit body (A) whereas valve 2 (10) is situated in the second part (B) of unit body. Besides, first part (A) and second part (B) of unit body are interconnected. Pressure transfer channel (28) from outlet (3) to membrane side (24), which is opposite to valve 1 (6) crosses parting surface (C) between the first (A) and second (B) parts of unit body.
EFFECT: simplification of valve unit design.
10 cl, 2 dwg
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