289 Series Relief Valve / Backpressure Regulators

The 289 Series pressure relief valves are throttling relief valves used downstream of pressure regulators to protect the downstream system from overpressure. A smooth throttling action minimizes pressure surges in the system during relief operation. The 289 Series pressure relief valves are ideal for low-pressure settings due to the increased sensitivity provided by a large diaphragm area. These pressure relief valves are available in 3/4, 1 or 2-inch (DN 20, 25 or 50) body sizes. The 289 Series pressure relief valves are small and compact, making them suitable for areas limited in space.

Features

Compact
High Flow Rates
Reliability Due to Simplicity
Tight Shutoff

Body Sizes and End Connection Styles

3/4, 1, or 2-inch (DN 20, 25 or 50) NPT

Maximum Relief (Inlet) Pressure

100 psig (6,9 bar)

Relief Set Pressure Range

7-inches w.c. to 75 psig (0,02 to 5,2 bar) in several ranges

Pressure Registration

Internal

Temperature Capabilites

Nitrile: -20 to 180°F (-29 to 82°C)
Fluoroelastomers (FKM): 20 to 300°F (-7 to 149°C) / Available with Types 289H and 289HH only

Shipping Weights

Type 289H
1-inch (DN 25) - 4 lb (1,8 kg)
2-inch (DN 50) - 15 lb (6,8 kg)
Type 289HH
1-inch (DN 25) - 4 lb (1,8 kg)
Type 289L
3/4 or 1-inch (DN 20 or 25) - 1.5 lb (0,68 kg)

Title

Document Type

	289 Relief Valve	Bulletins
	289 Relief Valve	Instruction_Manuals