1" Isolation Flow Control Flange, Lead-Free, Thread x Flange

Bell & Gossett 1" Check-Trol™ Isolation Flow Control Flange – Compact, Code-Compliant, Contractor Ready

Engineered for hydronic system efficiency, the Bell & Gossett Check-Trol™ combines three critical functions—flow check, isolation valve, and circulator flange—into a single precision-cast component. Designed for use in closed-loop heating and cooling systems, this flange allows for circulator service or replacement without draining the system and prevents gravity flow during pump-off cycles.

This 1" NPT x flange connection model is constructed from lead-free brass and features chrome plating for enhanced durability. Ideal for retrofit applications or new installations, the Check-Trol™ saves space, simplifies layouts, and reduces install time—making it a smart choice for any mechanical contractor.

Core Performance Features

• All-in-One Design – Combines isolation valve, spring check, and flange into one compact, field-ready fitting.
• Built-In Spring Check – Eliminates unwanted backflow and thermal siphoning without the need for separate components.
• Quick Service Access – Isolates circulators for maintenance or replacement without system drainage.
• Heavy-Duty Construction – Cast lead-free brass body with chrome finish resists corrosion and delivers long service life.
• Free-Floating Companion Flange – Aligns easily to pump flanges to reduce torque stress and simplify installation.

Technical Specifications

• Connection: 1" NPT x Flange
• Length: 4-7/16 inches
• Max Working Pressure: 150 PSI
• Max Temperature: 200°F (93°C)
• Material: Lead-free brass, chrome-plated
• Compliance: Suitable for potable systems, meets low-lead requirements

Installation Notes

Designed with professional installation in mind, the Check-Trol™ flange should be installed on the discharge side of the circulator pump. Proper torque on flange bolts and alignment with pump ports ensures a secure seal and long-term reliability. This unit is compatible with most standard circulators, including Bell & Gossett ecocirc® and other common hydronic models.

Trusted by the Trade

For contractors who value speed, flexibility, and reliability in the field, the Bell & Gossett Check-Trol™ delivers. Its integrated valve functionality reduces leak points, minimizes install time, and ensures consistent system performance in both residential and commercial hydronic applications.

Choose Bell & Gossett for Proven Performance

With a century-long legacy in fluid handling, Bell & Gossett continues to set the standard in HVAC system components. The Check-Trol™ flow control flange is no exception—designed to streamline your installation process and support efficient, long-lasting hydronic system operation.