Multiport Gauge Root Valve

The multiport gauge root valve (commonly referred to as a GV series gauge valve) is a compact, highly efficient instrumentation valve designed to facilitate the safe installation, isolation, and calibration of pressure gauges, switches, and transmitters. Machined from premium forged stainless steel bar stock, its distinctive multi-port design configuration includes one process inlet and up to three multi-functional outlets. This allows an operator to install a primary measuring instrument alongside optional bleed valves, test gauge connections, or blanking plugs within a single body block. By optimizing the instrumentation loop layout, it drastically reduces pipeline space, weight, and critical fugitive emission pathways in heavy-duty petrochemical and process industries.

Technical Specifications

• Valve Design Configuration: Multiport Gauge Root Valve / GV Block Needle Valve

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

• Stem Tip Architecture: Non-rotating hardened chrome stem tip to eliminate seat wear and galling

• Inlet Process Connection: 1/2" NPT Male thread (or customizable weld stubs)

• Outlet Instrument Connections: Multiple 1/2" NPT Female ports (typically three ports for versatile hookups)

• Bonnet Construction: Heavy-duty screwed bonnet with metal-to-metal primary pressure seal

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

• Maximum Working Temperature (PTFE): Up to 232°C (450°F) for general instrumentation lines

• Maximum Working Temperature (Graphite): Up to 648°C (1200°F) for extreme thermal steam loops

• Packing Seal Compound: Chevron-style Teflon (PTFE) standard / Flexible Graphite for severe service

• Handle Assembly Design: Ergonomic stainless steel T-bar handle with a robust locking set-screw

• Safety Mechanism: Structural anti-blowout lower stem configuration preventing stem ejection under intense line surges

• Orifice Clearance Size: 0.156 inch (4.0mm) precision straight-through bore for lag-free signal transmission

• Flow Coefficient (Cv Rating): 0.45 fully unseated to ensure optimized fluid response times

• Port Customization: Equipped with heavy-duty hex blind plugs on unused outlet ports

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

• Environmental Compliance: Certified low-emission packing systems conforming to ISO 15848-1 standards

• Sour Gas Compatibility: Materials fully compliant with NACE MR0175 / ISO 15156 regulations

• Body Marking Traceability: Heat code tracking, shell rating, and material stamp permanently laser-etched on the valve block

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