PN16 DN250 Gearbox Globe Valve with Bolted Bonnet

The PN16 DN250 Gearbox Globe Valve with Bolted Bonnet by Hanno Valve is engineered in accordance with DIN and EN standards to fit standard European flange profiles seamlessly. Inside the valve, a 2Cr13 stainless steel stem drives an A105 forged disc surfaced with 13Cr alloy against a matching hardfaced body seat. A 304+graphite spiral wound gasket ensures leak‑tight bonnet flange sealing, while multi‑ring graphite gland packing prevents stem leakage under continuous thermal cycling. Manufactured under strict ISO9001 quality management, every PN16 DN250 valve undergoes rigorous physical, chemical, and pressure testing in our Zhejiang facility, delivering a stable, long‑life solution for heat supply, gas distribution, and low‑pressure chemical transport.

Product Features

• Optimized Internal Flow Path: Contoured valve cavity lowers pressure drop and fluid turbulences across the DN250 port.
• Ease of Inline Servicing: Top‑entry bolted bonnet allows maintenance personnel to inspect or re‑grind the 13Cr seat overlay without unbolting the valve body from the pipeline.
• Dual‑Material Sealing Integrity: Combines metallic seat hardfacing with resilient graphite packing for continuous bubble‑tight closure.

Application Scenarios

• Municipal Heat Supply: Urban steam and hot water distribution stations.
• Industrial Utility Water: Cooling tower circulation lines and plant water intake manifold.
• Natural Gas Utilities: Low‑pressure town gas transportation and regulation stations.

Technical Specifications

Procurement Process

1. Specification Confirmation: Submit fluid type, operating temperature, and flange drilling requirements.
2. Sample / Small Batch Validation: Initial sample testing supported for project approval.
3. Mass Production & Factory Inspection: Real‑time production photos, raw material spectral reports, and pressure test videos sent to client.
4. Dispatch: Packed in export‑standard wooden boxes with full shipping documentation.

After‑Sales Service

• Installation Guidance: Detailed written manuals and step‑by‑step video tutorials covering gland adjustment and bolt torquing.
• Spare Parts Availability: Handwheels, seal gaskets, gland packing kits, and gearboxes stocked for quick shipment.
• Warranty Commitment: 18‑month global quality guarantee with prompt technical support.

Frequently Asked Questions (FAQ)

What standard face‑to‑face dimensions does this PN16 DN250 valve follow?

Dimensions comply with EN 558‑1 / DIN 3202 standards, ensuring full interchangeable fitment with existing European pipelines.

Why choose a bolted bonnet over a pressure seal bonnet for PN16 rating?

Bolted bonnets offer cost‑effective, straightforward disassembly and reliable sealing performance for low‑to‑medium pressure ranges like PN16.

Can this valve be used for steam applications at 200°C?

Absolutely. The PN16 DN250 Gearbox Globe Valve with Bolted Bonnet 304+graphite gasket and graphite packing are fully rated for continuous saturated steam up to 400°C.