Differential Pressure Transmitter Manifold

The H-type (coplanar/I-shaped) 3-way instrumentation manifold valve is a specialized fluid control block designed for direct flange-to-flange coupling with differential pressure (DP) transmitters, such as the classic 1151 and modern 3051 series. By incorporating two main line isolation block valves and one central equalizing valve into a single solid forged bar-stock body, it allows process engineers to safely isolate the transmitter from line pressure and equalize the high-and-low pressure chambers during routine zero-point calibration. This direct-mount setup eliminates excessive pipeline joints, significantly decreasing installation space, weight, and fugitive emission leak paths in global petrochemical, refining, and power generation infrastructure.

Technical Specifications

• Manifold Design Configuration: H-Type / Coplanar /工字型 3-Way Instrument Manifold

• Valve Component Layout: Two Isolation (Block) Valves and One Equalizing Valve

• Body Material Construction: Forged 316 Stainless Steel (ASTM A182 F316 / ASTM A479)

• Stem Tip Configuration: Non-rotating hardened chrome stem tip to guarantee scratch-free metal seating

• Process Side Connection: 1/2" NPT Female or Flanged connection (industry standard 2-1/8 inch / 54mm center distance)

• Instrument Side Connection: Direct flanged face mounting matching standard differential pressure transmitters

• Bonnet Sealing System: Heavy-duty chrome-plated bonnets with metal-to-metal body-to-bonnet seals

• Nominal Pressure Rating: 6000 psi / PN400 (Up to 41.3 MPa / 413 bar)

• Maximum Allowable Temperature: 232°C (450°F) with PTFE / 648°C (1200°F) with Graphite seals

• Packing Seal Compound: Chevron-style Teflon (PTFE) standard / Flexible Grafoil for high thermal lines

• Handle Assembly Design: Color-coded metallic T-bar handles (Blue for Isolate, Green for Equalize)

• Handle Locking Mechanism: Integrated handle set-screws preventing operational loosening from line vibration

• Safety Feature: Full anti-blowout lower stem design to maximize operator safety under intense line surges

• Orifice Clearance Size: 0.156 inch (4.0mm) straight bore for low-pressure drop performance

• Flow Coefficient (Cv Rating): 0.52 maximum when valves are fully unseated

• Flange Gasket Interface: PTFE or Viton O-rings included for a bubble-tight flange seal face

• Testing Guidelines Met: 100% factory hydrostatic shell and pneumatic seat integrity checked to API 598

• Environmental Compliance: Low-leakage fugitive emission shaft seals certified to ISO 15848-1

• Sour Gas Compatibility: Designed to comply perfectly with NACE MR0175 / ISO 15156 standards

• Body Marking Traceability: Full material heat-code permanently stamped on the valve housing exterior

• Quality Documentation: Shipped accompanied by original EN 10204 3.1 material composition certificates