Catalogs >
FISHER REGULATORS >
289 series Spring-Loaded Relief Valves

289 series Spring-Loaded Relief Valves
8Pages

Catalog excerpts

289 series Spring-Loaded Relief Valves - 1

289 Series Spring-Loaded Relief Valves Figure 1. Types 289H, 289L and 289U Relief Valves Introduction The 289 Series relief valve is a throttling relief valve used downstream of pressure regulators to protect the downstream system from overpressure. A smooth throttling action minimizes pressure surges in the system during emergency operation. These relief valves are available in 1/4, 3/4, 1 or 2 NPT sizes with spring ranges (relief pressure settings) from 5 in. w.c. to 75 psig / 12 mbar to 5.2 bar. All sizes above 1/4 NPT feature a pitot tube booster (Figure 1) for achieving the highest possible relief capacity with a minimum buildup of system pressure. When the valve is opening, high gas velocity through the orifice creates an area of relatively low pressure near the end of the pitot tube. This pitot tube effect forms a partial vacuum above the diaphragm which helps to open the valve. Features • Throttling Type Relief—Smooth, sensitive throttling action minimizes pressure surges. • High Flow Rates—As shown by the Figure 3 capacity curves, high flow rates can be achieved with minimum pressure buildup due to the boosting system which increases the relief valve opening. • Small Size—The 289 Series relief valves are small and compact, making them suitable for areas limited in space. • Reliability Due to Simplicity—A single internal assembly decreases the possibility of mechanical failure. D100154X012 The relief valve diaphragm functions as a valve disk to control flow in all types except the Types 289H and 289HH, which use O-ring seats. The Nitrile (NBR) or Neoprene (CR) seating surfaces provide tight shutoff. The 289 Series relief valves are ideal for low-pressure settings due to the increased sensitivity provided by the large diaphragm area.

Open the catalog to page 1

289 series Spring-Loaded Relief Valves - 2

Bulletin 71.4:289 Specifications Available Configurations 289A: 1/4 NPT spring-loaded relief valve for Type relief pressure settings of 3 to 22 psig / 0.21 to 1.5 bar, two spring ranges 289H: 1 or 2 NPT spring-loaded relief valve Type for relief pressure settings of 1 to 50 psig / 0.07 to 3.4 bar four spring ranges, in the 1 NPT and of 7 in. w.c. to 10 psig / 17 mbar to 0.69 bar, four spring ranges, in the 2 NPT 289HH: 1 NPT spring-loaded relief valve for Type relief pressure settings of 45 to 75 psig / 3.1 to 5.2 bar 289L: 3/4 or 1 NPT spring-loaded relief valve Type for relief pressure...

Open the catalog to page 2

289 series Spring-Loaded Relief Valves - 3

INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Figure 2. Types 289H, 289L and 289U Operational Schematics Table 1. Maximum Allowable Relief (Inlet) Pressure AVAILABLE CONFIGURATION SPRING RANGE (RELIEF PRESSURE SETTINGS) MAXIMUM ALLOWABLE RELIEF (INLET) PRESSURE(1) SPRING PART NUMBER COLOR CODE Silver Silver Pink Red Silver Green Dark Blue Gray Dark Green Red Stripe Silver Silver 1. This value indicates the relief pressure setting plus pressure build-up.

Open the catalog to page 3

289 series Spring-Loaded Relief Valves - 4

70 1 NPT TYPE 289H VENT SCREEN INSTALLED INLET PRESSURE, psig CAPACITIES IN THOUSANDS OF SCFH / Nm³/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS AT 14.7 psia AT 60°F / 1.01325 bar AT 0°C CAPACITIES IN THOUSANDS OF SCFH / Nm³/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS AT 14.7 psia AT 60°F / 1.01325 bar AT 0°C NOTE: 1. LESS THAN A 5% CAPACITY LOSS CAN BE EXPECTED WITH THE VENT SCREEN INSTALLED ON THE 2 NPT TYPE 289H AT MAXIMUM FLOW. 2. WHEN SELECTING ANY RELIEF VALVE FOR INSTALLATION DOWNSTREAM OF THE REGULATOR, THE CAPACITY OF THE RELIEF VALVE SHOULD BE COMPARED WITH THE WIDE-OPEN CAPACITY OF THE...

Open the catalog to page 4

289 series Spring-Loaded Relief Valves - 5

90 INLET PRESSURE, psig 1 NPT TYPE 289HH VENT SCREEN INSTALLED SPRING 1D7455T0012 1 NPT TYPE 289HH NO VENT RESTRICTION SPRING 1D7455T0012 INLET PRESSURE, psig CAPACITIES IN THOUSANDS OF SCFH / Nm³/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS AT 14.7 psia AT 60°F / 1.01325 bar AT 0°C 0.35 INLET PRESSURE, psig CAPACITIES IN 0.6 SPECIFIC GRAVITY GAS — CUBIC FEET PER HOUR / Nm3/h—14.7 psia AT 60°F / 1.01325 bar AT 0°C NOTE: 1. WHEN SELECTING ANY RELIEF VALVE FOR INSTALLATION DOWNSTREAM OF THE REGULATOR, THE CAPACITY OF THE RELIEF VALVE SHOULD BE COMPARED WITH THE WIDE-OPEN CAPACITY OF THE REGULATOR....

Open the catalog to page 5

289 series Spring-Loaded Relief Valves - 6

4 3/4 and 1 NPT TYPE 289L VENT SCREEN INSTALLED INLET PRESSURE, psig CAPACITIES IN SCFH / nm³/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS AT 14.7 PSIA AT 60°F / 1.01325 bar AT 0°C CAPACITIES IN SCFH / nm³/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS AT 14.7 psia AT 60°F / 1.01325 bar AT 0°C NOTE: 1. HEN SELECTING ANY RELIEF VALVE FOR INSTALLATION DOWNSTREAM OF THE REGULATOR, THE CAPACITY OF THE W RELIEF VALVE SHOULD BE COMPARED WITH THE WIDE-OPEN CAPACITY OF THE REGULATOR. 2. BUBBLE POINT RELIEF SETTING is NOTED ON EACH CURVE. 3. O CONVERT TO EQUIVALENT CAPACITIES OF OTHER GASES, MULTIPLY VALUES...

Open the catalog to page 6

289 series Spring-Loaded Relief Valves - 7

Bulletin 71.4:289 PROTECTIVE VENT PIPE WITH RAIN CAP 2 NPT TYPE 289H RELIEF VALVE LARGE SERVICE REGULATOR AJ4698_C A1947_1 Figure 4. Typical Installation of a 289 Series Relief Valve Ordering Information The 289 Series relief valves may be installed in any position. However, the outlet connection must be protected against the entrance of rain, snow, insects or any other foreign material that may plug the outlet or affect the opening and closing of the valve (see Figure 4). If it is necessary to pipe away the outlet, remove the outlet screen (if one is present). When ordering, specify: Flow...

Open the catalog to page 7

289 series Spring-Loaded Relief Valves - 8

Industrial Regulators Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Tescom Corporation Asia-Pacific Singapore 128461, Singapore Tel: +65 6770 8337 Middle East and Africa Dubai, United Arab Emirates Tel: +971 4811 8100 Middle East and Africa Dubai, United Arab Emirates Tel: +971 4811 8100 For further information visit www.emersonprocess.com/regulators The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark...

Open the catalog to page 8