"TOTAL DOES IT ALL"

• Refineries.
• Chemicals.
• Petrochemicals.
• Hydrocarbon Processing.
• Thermal and Co-generation Power.
• Marine and Government.
• Pulp and Paper.
• Nuclear.
• Oil and Gas - Onshore and Offshore.

• Steam.
• Gases.
• Vapors.
• Liquids.
• Corrosive and toxic fluids

• ASME Code Section VIII.
• ASME Code Section III.
• National Board Capacity
  Certifications.
• API Standard 526.
• API Standard 527.

• Sizes 1D2 [25mm D 50mm] to 8T10
  [200mm T 250mm].
• Flange Classes ANSI 150 - ANSI 2500 in accordance with the limits of API
  Standard 526. Set pressures from 3 psig [0.2 barg] to 6000 psig [414 barg].
• Temperatures from -400°F to +1000°F [-240°C to +538°C].
• Nineteen standard material variations for corrosive, toxic, or unique applications.

VALVE TYPES

• Model R is a conventional, top guided, single ring, full nozzle, unbalanced
  pressure relief valve.
• Model RB is a balanced bellows valve.
• Model RO is the model R with an elastomer soft seat for improved seat leakage protection. 
• Model RBO is the model RB with soft seat. 
• Model RS is an open yoke pressure relief valve with a plain lever cap style for steam service.
• Model JR or JRB is steam jacketed valve for applications involving viscous or polymerizing fluids.
• Model NR or NRB is the corresponding model meeting the requirements of ASME III.

CAP STYLE

• Screwed cap.
• Plain lift lever cap.
• Packed lift lever


• Bolted cap.


• Optional test gag screws.


• Yoke type gag, Model TYW-3 or TYW-
5 for plain lever caps.

• All R/RB models use a threaded stem
and a drilled/tapped bonnet to permit easy cap conversions in the field without internal parts change out.

• Three bill of material levels.


• Level 1 for compliance of wetted parts
in closed position.

• Sour gas trim for CS valve in H2S environment.


• SS trim for SS valve in H2S environment.

• One trim design meets the ASME
Code Sections VIII and III performance criteria for steam, gas, vapor, and liquid applications. No special liquid trim is required, as is required in competitive designs.

• The unique disc holder and nozzle
ring design provides stable operation on steam, gases, vapors, and liquids.

• Full capacity rating at 10% over pressure.


• Conversion liquid trim not necessary,
reducing spare parts.
Superior Alignment Internal

• Nozzle threads into the valve body at
the body bowl. The thread alignment is closer to the critical seating surface and guiding surfaces.

• Standard Inconel 625 provides corrosion excellent resistance and mechanical toughness. 
• No stress corrosion cracking in harsh
environments involving sour gas (H2S) or chlorides. 
• The bellows threads on the disc holder with a lock nut and gasket. 
• No welded attachment permits lower cost replacement of the bellows.

• The standard disc is reversible to provide a spare seating surface on every part.


• Every O-ring soft seated disc retains the standard metal seating surface on the reverse side. 
• The lower half of the stem assembly, called the Point, is not integral with the disc holder. This permits lower cost of replacement for a critical guiding component. Competitor designs incorporate the guiding surface on the disc holder shaft. 
• Springs within an orifice and pressure class are designed with a fixed inside diameter to eliminate custom machined spring steps. 
• Nozzle ring is common to all pressure
ranges or seat designs within an orifice size, reducing spare parts.

• When considering the total cost of continued operation, maintenance, and spare parts, the Series R/RB is the leader. It delivers exceptional performance through state of the art design features, and provides real value to its users. Backed by our extensive repair and service organization network, customers receive high quality, safety products which continue our unequaled reputation as the leader in pressure relief valve. Technology for Safety, Environmental Protection, and Productivity Improvement.