Sliding Type Line Blind Valve 10" Class 300 ASME B16.34, Manual Screw-Operated
Introduction This 10" Class 300 Sliding Line Blind Valve provides absolute positive isolation for medium‑ to high‑pressure pipelines, combining the reliability of a solid physical barrier with the simplicity of manual screw‑operated actuation. Unlike conventional valves that rely on seats prone to wear, the sliding blind mechanism creates a true physical barrier, ensuring zero leakage during maintenance without the need for system depressurization. This significantly reduces downtime and enhances personnel safety. The manual screw‑operated design offers precise, controlled movement of the blind plate, with inherent self‑locking capability to maintain position under pressure—ideal for applications where electric or pneumatic power may not be available or preferred. Constructed to ASME B16.34 with RF flanges per ASME B16.5, this valve is available in forged carbon steel (A105), stainless steel, or alloy materials to suit your service conditions. Each unit is 100% pressure tested to API 598. This 10" Class 300 configuration is a popular choice for steam, oil, gas, and chemical pipelines. Other sizes from 1" to 60" and pressure classes up to Class 2500 are available as part of our full line blind valve series. THD-Slide Cutout Features 1.Manual Screw‑Operated with Self‑Locking Precision screw drive allows smooth, controlled positioning of the blind plate. The self‑locking mechanism maintains position under pressure without additional braking devices. 2.Absolute Physical Isolation Solid blind plate creates a true barrier, ensuring zero leakage during maintenance—unlike seat‑dependent valves that can wear or degrade over time. 3.Inline Operation Without Depressurization Sliding mechanism enables switching between flow and blind positions without system blowdown, reducing downtime and product loss. 4.10″ Class 300 – The Optimal Balance Offers higher pressure capability than Class 150 while remaining more economical than Class 600, making it a versatile choice for a wide range of industrial applications. 5.Forged Carbon Steel Construction A105 forged body provides high strength, impact resistance, and reliable performance under thermal cycling. 6.Tested to API 598 100% hydrostatic and pneumatic testing ensures leak‑tight performance before shipment. Standard Specifications Parameter Specification Type Sliding Line Blind Valve Size 10″ (DN250) Pressure Rating Class 300 (PN50) Connection RF Flange, ASME B16.5 Operation Manual Screw-Operated (Self-locking) Body Material A105 Forged Carbon Steel (other alloys available) Seal / Seat Material Metal-to-Metal (Stainless Steel + Graphite) Design Standard ASME B16.34 Face-to-Face Dimension Per ASME B16.10 or manufacturer standard Test & Inspection API 598 (100% hydrostatic & pneumatic) Temperature Range -29°C to +425°C (depending on sealing) Applicable Media Steam, Oil, Gas, Water, Hydrocarbons Application Pipeline isolation, refineries, petrochemical plants, power generation Technical Drawing Flexible Design Options Tailored Configurations for Demanding Applications Beyond the base model, this line blind valve can be customized for high-temperature service, fire-safe requirements, and zero-emission (drip-proof) operation. For installations where space is at a premium, a compact variant is available, offering the same robust isolation performance in a reduced footprint. Simplified Seal Maintenance– No Disassembly Required Seals are integrated into the spectacle plate, allowing operators to inspect or replace them without dismantling the valve. Condition checks can be performed while the valve remains in service, before any position change, ensuring seal integrity is verified before operation. Low Total Cost of Ownership The valve’s streamlined, heavy‑duty construction delivers reliable positive shut‑off with minimal upkeep. Its unique actuation mechanism allows a single operator to quickly and safely isolate the pipeline—no tools required—reducing labor time and simplifying maintenance procedures. Options ●Hand Wheel Extensions ●Locking Device ●Limit Switches ●Drain/Vent ports ●Spectacle Plate Covers to Protect Seals ●Compact Design (integral tapped end flange) ●Rain/Dust Shield ●Torque Limiter