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P98H Back Pressure Regulator / Relief Valve

P98H Back Pressure Regulator / Relief Valve

Product catalog summary

Overview: The P98H is a back pressure regulator and relief valve used to control upstream pressure and release excess pressure when necessary. It is suitable for industries such as pulp and paper, chemical processing, water and wastewater systems, and steam injection.

Specifications:

Maximum Inlet Pressure: 300 PSIG for WCB Steel/SS, 250 PSIG at 400°F for Cast Iron, 300 PSIG at 300°F for Cast Iron.
Pressure Ranges: 5–15 PSIG, 15–35 PSIG, 25–75 PSIG, 70–140 PSIG, 130–200 PSIG.
Body Sizes: 3/4 NPT, 1 NPT.
Orifice Size: 9/16".
Weight: Approximately 20 lb (9.1 kg) for both 3/4" and 1" NPT.

Materials and Options:

Body, Bonnet, Diaphragm Case Options: Cast Iron, Steel, Stainless Steel.
Diaphragm Options: 302 SS, Fluorocarbon, Neoprene, Monel.
Valve Plug/Seat Options: Nitrile, Metal, Fluorocarbon with SS Orifice.

Installation: The relief valves can be installed in any position as long as the flow direction matches the arrow on the body.

Performance Capacities:

Water Relief Capacities: Detailed in gallons per minute (GPM) with various pressure settings and buildup levels.
Steam Relief Capacities: Provided in pounds per hour (LB/H) with metal diaphragm only.
Air Relief Capacities: Measured in standard cubic feet per hour (SCFH) with both neoprene and metal diaphragms.

Temperature Ranges:

Body & Bonnet: Cast Iron (-40° to +406°F), Steel (-20° to +450°F), Stainless (-40° to +450°F).
Diaphragm & Seat: Nitrile and Neoprene (-40° to +180°F).

Part Matrix: Includes detailed part numbers and color codes for various components and configurations.

Catalog excerpts

P98H Back Pressure Regulator / Relief Valve-1

P98H Back Pressure Regulator / Relief Valve The P98H monitors upstream pressure and opens to relieve excess pressure increases above setpoint. As a Back Pressure Regulator, the upstream pressure is monitored and released downstream when the setpoint is exceeded. Applications • Pulp and Paper - Boilers, Heaters, PM Drums • Chemical Boilers, Process Heaters • Water and Waste Water Systems • Steam Injection P98H Part Matrix Specifications BelGAs Spring Range P98H Maximum Body & Bonnet Temp Range Materials of Construction Body, Bonnet, Diaphragm Case Cast Iron Options Steel Stainless Steel Options Neoprene P98H Maximum Diaphragm & Seat Temp Range Monel Valve Plug / Seat Nitrile Valve Plug / SS Orifice Options Metal Valve Plug / SS Orifice

Open the catalog to page 1

P98H Back Pressure Regulator / Relief Valve-5

Nominal Body Size, Inches (DN) Pressure Buildup Over Relief Setting, PSIG (BAR) Nominal Body Size, Inches (DN) 655-712-000 655-712-001 655-712-002 655-717-000 Part Number Color Code P98H Flanged Unit Dimension, Inches belgas.net

Open the catalog to page 5

P98H Back Pressure Regulator / Relief Valve-6

Kit Includes Part Number FKM Diaphragm, Thru Hole Gasket, 316SS Orifice, 316SS/Nitrile Valve Plug, Seat O-ring Retainer and O-ring, Seat Machine Screw

Open the catalog to page 6

P98H Back Pressure Regulator / Relief Valve-7

P98H Back Pressure Regulator / Relief Valve 1-1/2" or 2" The P98H monitors upstream pressure and opens to relieve excess pressure increases above setpoint. As a Back Pressure Regulator, the upstream pressure is monitored and released downstream when the setpoint is exceeded. Applications • Pulp and Paper - Boilers, Heaters, PM Drums • Chemical Boilers, Process Heaters • Water and Waste Water Systems • Steam Injection Spring Range Materials of ConstructionP98H Maximum Body & Bonnet Temp Range Cast Iron P98H Maximum Diaphragm & Seat Temp Range Body, Bonnet, Diaphragm Case

Open the catalog to page 7

P98H Back Pressure Regulator / Relief Valve-8

Nominal Body Size, Inches Installation These relief valves may be installed in any position, as long as flow will be in the same direction as that of the arrow cast on the body. P98H Parts 1-1/2" & 2"

Open the catalog to page 8

P98H Back Pressure Regulator / Relief Valve-10

P98H Water Relief Capacities with an Elastomer Diaphragm

Open the catalog to page 10

P98H Back Pressure Regulator / Relief Valve-11

P98H Steam Relief Capacities with a Stainless Steel Diaphragm A Spring Range Body Size, Inches (DN) Range Part Number Relief Pressure Setting Color Code Pressure Buildup Over Relief Setting, PSIG (BAR) Flow at Relief Setting Light Gray Light Blue Dark Gray A DIVISION OF MARSH BELLOFRAM TRIM RANGE MAX INLET LOT CASING PRESS AT TEMP

Open the catalog to page 11

P98H Back Pressure Regulator / Relief Valve

P98H Back Pressure Regulator / Relief Valve

Catalog excerpts

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