Valve Selector - D thru T Orifice (Metric Units)

MARKETS SERVED

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

MEDIA SERVED

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

CODE AND STANDARD COMPLIANCE

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

DESIGN SCOPE

• Sizes 1D2 [25mm D 50mm] to 8T10
  [200mm T 250mm].
• Flange Classes ANSI 150 - ANSI 2500in 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.

NACE MR-0175 (H2S) SERVICE

• 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.

ADVANCED DESIGN ALL MEDIA TRIM

• 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% overpressure.
  
• 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.
  

SUPERIOR CORROSION RESISTANT BELLOWS

• 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 locknut and gasket.
• No welded attachment permits lower cost replacement of the bellows.

ADVANCED DESIGN TO REDUCE SPARE PARTS

• 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.

COST OF OWNERSHIP

• 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.