Type 431/433

Safety Relief Valve

Type 431

The type 431/433 safety relief valves are ideal relief valves for medium mass flows. Their large proportional range leads to consistent functioning and relief of pressure peaks, particularly with liquids. Both proportional and safety relief valves are characterized by particularly stable operation.

Type 433

The 431/433 spring loaded, cast construction with flanged connections for nominal pressure ratings up to PN 40 / PR #150. Three body materials: stainless steel, carbon steel and nodular cast iron.

Technical Information
Type	Bonnet	Flange ANSI B 16.5		Flange DIN 2501		Form	Opening Characteristic
		PR	NPS	PN	DN
431	Open	#150	1/2"...6"	16...40	15...150	Angle Type	Safety Relief
433	Closed