Forged Pressure Seal Globe Valve

Forged Pressure Seal Globe Valves provide reliable shut-off and precise throttling service in extreme high-pressure and high-temperature steam, water, and process fluid applications. Featuring a forged body structure and a pressure-activated internal sealing design, these valves turn fluid operating pressure into sealing force to eliminate external body-bonnet leakage risks while reducing total installed weight compared to conventional bolted-bonnet valves.

Self-Tightening Sealing Mechanism: Cavity pressure acts directly against the pressure seal ring, continuously increasing joint integrity as system line pressure rises.

Homogeneous Forged Structure: Forged carbon, alloy, and stainless steel bodies eliminate internal voids, porosity, and structural grain boundaries commonly found in cast materials.

Hardfaced Seating Surfaces: Cobalt-chromium alloy overlay on the disc and integral body seat resists high-differential-pressure erosion, seat wiping, and wire-drawing.

Guided Disc Assembly: Fully guided disc configuration maintains precise concentric alignment with the seat ring, eliminating stem bending forces and seat scoring during continuous throttling.

Low-Emission Packing System: Die-formed flexible graphite packing sets with anti-extrusion braided rings ensure long-term fugitive emissions control per stringent industrial environmental standards.
 

Internal Pressure Seal Bonnet Assembly: Utilizes a segmented retaining ring, thrust ring, metallic or flexible graphite pressure seal ring, and bonnet sleeve to maintain joint compression under severe thermal transient conditions.

Load-Bearing Thrust Structure: Segmented thrust rings absorb axial pressure forces exerted on the bonnet, eliminating the need for heavy external bonnet flange studs.

Non-Rotating Linear Stem: ACME thread design with ground and polished stem surfaces reduces stem drive torque and prevents torsional wear on the packing set.

Integral Top Backseat: Precision-machined back seating surface provides positive stem sealing to protect packing sets when the valve is in the fully open position.

Flow control occurs via a linear stem driving a hardfaced disc perpendicularly toward a stationary seat. Clockwise rotation of the stem pushes the disc downward into the fluid stream to establish tight seat closure. Internal line pressure pushes upward against the floating bonnet, driving the metallic pressure seal ring against the tapered body wall and thrust ring. Higher system line pressure results in higher seal compression, creating a leak-free seal without requiring external tightening torque.

Socket Weld Ends: Machined according to ASME B16.11 for high-pressure small-bore piping runs.

Butt Weld Ends: Prepared to ASME B16.25 pipe matching schedules including Schedule 80, Schedule 160, and XXS.

Flanged Ends: Integrated forged flanges in Raised Face or Ring Type Joint configurations to ASME B16.5 requirements.

Body Configurations: Available in standard straight T-pattern for isolation or Y-pattern for reduced fluid turbulence and lower pressure drop.

Manual Operation: Direct handwheels fitted with anti-friction needle bearings; impact handwheels provided on Class 2500 and higher ratings to minimize rim effort.

Gear Operation: Enclosed weatherproof bevel gear units with ISO 5211 mounting interfaces for overhead or high-torque installations.

Automated Drive Units: Factory-prepared top flanges for immediate integration of multi-turn electric actuators or linear pneumatic actuators.

Pressure Testing: 100% shell hydrostatic testing at 1.5 times working pressure and seat leak testing performed in full compliance with API 598.

Fire Safety Standards: Certified fire-tested designs according to API 607 and ISO 10497 standards.

Sour Service Compliance: Optional material treatment compliant with NACE MR0175 and ISO 15156 guidelines for hydrogen sulfide environments.

Supercritical Power Plants: Main steam lines, boiler feed pump isolation, high-pressure drains, and vent valves.

Hydroprocessing Facilities: High-pressure hydrogen injection lines, hydrocracker feed systems, and separator unit isolation.

Petrochemical Refineries: Continuous high-temperature hydrocarbon fluid processing units.

Thermal Enhanced Recovery: High-pressure steam distribution headers and steam injection wellheads.

Step 1: Establish maximum operating temperature and pressure to confirm the required ASME Pressure Class Rating (Class 900 through Class 4500).

Step 2: Select body material based on fluid chemistry: ASTM A105 for non-corrosive steam and water below 425 Degrees Celsius; ASTM A182 F22 or F91 for steam above 425 Degrees Celsius; ASTM A182 F316 for corrosive chemical media.

Step 3: Define line end connection type (Socket Weld, Butt Weld with pipe schedule specification, or Flanged).

Step 4: Choose body pattern: Straight T-pattern for general isolation service or Y-pattern for throttling applications requiring reduced flow resistance.

Step 5: Determine drive requirement (Manual Handwheel, Impact Handwheel, Bevel Gearbox, or Actuator Mounting Kit).

Material Traceability: Complete EN 10204 Type 3.1 Material Test Reports supplied with heat numbers for all pressure-retaining forgings.

Non-Destructive Examination: Positive Material Identification testing, Magnetic Particle Inspection on carbon/alloy forgings, and Liquid Penetrant Inspection on hardfaced seating areas.

Testing Documentation: Individual pressure test certificates, dimensional reports, and certificate of compliance included with every shipment.

Customized end-to-end face dimensions to match legacy replacement requirements.

Corrosion-resistant alloy materials including Duplex, Super Duplex, and Nickel Alloy trims.

Extended stem and bonnet configurations for insulated piping installations.

High-performance inorganic zinc silicate exterior coating systems for offshore marine environments.