1" Brass Circulator Flange with Ball Valve, Less Drain, Female, Iron Pipe x Iron Pipe

Professional-Grade Control – Webstone® 4040 Isolator Flange Valve, 1" IPS x Flange

The Webstone® 4040 Isolator Flange is engineered for hydronic heating professionals who demand precision, reliability, and simplified installation. This forged brass valve combines shut-off and flange connections into one unit, minimizing components while maximizing efficiency on the job site.

Designed for Efficiency and Longevity

Built to withstand high-pressure systems and frequent use, the 4040 Series isolator flange is ideal for connecting circulator pumps in residential and light commercial hydronic applications. The uni-body construction reduces potential leak points and simplifies system service, making it a go-to solution for professional installers looking to save time without sacrificing performance.

Key Performance Features

• Forged Lead-Free Brass Body – Durable and corrosion-resistant, rated 600 PSI WOG.
• Full-Port Ball Valve – Allows unrestricted flow, reducing pressure drop across the system.
• Blowout-Proof Stem – Ensures valve integrity under pressure.
• PTFE Sealing Surfaces – Enhanced reliability with chemical- and heat-resistant materials.
• Adjustable Packing Gland – Enables resealing and in-field maintenance with minimal downtime.

Technical Specifications

• Connection Size: 1” IPS x Flange
• Material: Lead-Free Brass, PTFE seat and stem seal
• Pressure Rating: 600 PSI (non-shock, WOG)
• Temperature Range: 0°F to 250°F
• Configuration: Quarter-turn isolation with integrated flange
• Warranty: Manufacturer's Limited Lifetime

Installation Insights

The 4040 valve is designed to streamline pump installation, reduce labor, and improve access during future maintenance. The flange side mates directly with most common circulator pump flanges. We recommend torqueing bolts evenly and using appropriate flange gaskets to maintain a leak-free seal. A licensed professional should verify compatibility with system pressure, temperature, and flow requirements.

Benefits for Mechanical Contractors

Webstone’s isolator flanges are trusted across the industry for their rugged design and jobsite-ready functionality. The 4040 series in particular supports efficient installs, facilitates quick pump swaps, and minimizes system downtime. With features that enhance both safety and speed, it’s a smart choice for hydronic projects requiring dependable performance.