McDonnell & Miller 310447 | Blow Down Valve-Ball Type for 47,247,67,70B Water Feeders

McDonnell & Miller 310447 (Model 14-B) Blow Down Valve - Ball Type (for Series 47/247/67/70B Water Feeders)

A ball-type blow down valve replacement used on compatible McDonnell & Miller boiler controls/water feeders to flush ("blow down") the control and support proper low-water protection operation.

Features

• Ball-type blow down valve replacement (Model 14-B / part 310447)
• Full-ported ball action valve
• PTFE (Teflon) seats for bind-free, leak-tight ball movement
• Easy-open handle designed to keep hands away from hot water and steam
• Gasket and mounting screws included

Compatibility

• Listed for use with McDonnell & Miller Series 47, 247, 67, and 70B
• Manufacturer literature references applications for Series 47, 67, and 70/70B
• Must only be used where the manufacturer specifies this exact part number: 310447 (Model 14-B)

Installation

• Installation/service is intended for qualified personnel trained in the proper application, installation, and maintenance of steam/plumbing equipment
• Manufacturer safety/servicing guidance includes:
• Wear heat-resistant gloves when handling hot equipment/operating valves
• Allow the control and surrounding equipment to cool to 80°F (27°C) and allow pressure to release to 0 psi before servicing
• When blowing down, connect a drain pipe to avoid exposure to hot water/steam discharge
• Installation instructions include steps such as cleaning the gasket surface and orienting the handle so it can move through its full 90° range of motion
• Instructions reference connecting a 3/4" NPT blow down pipe to the control outlet

Maintenance

• Manufacturer maintenance guidance includes:
• Blow down weekly when the boiler is in operation
• Disassemble and inspect annually, including inspecting/cleaning the float chamber and equalizing piping
• Replace the blow down valve every 10 years (more often in demanding water conditions or high make-up water applications)
• Manufacturer testing guidance indicates the burner should shut off during blow down; if the control does not blow down and/or the burner does not shut off, shut down the boiler and have the system inspected by qualified personnel
• Reviews commonly describe it as an exact replacement that's easy to install, and many note it performs better/easier than older spring-style blow down valves
• Replacement reasons mentioned include leakage/corrosion on an older valve and keeping the low-water cut-off/control operating without replacing the entire unit
• One reviewer reported a packaging issue (only 3 of 4 attaching screws in the sealed package) and reused an old screw
• Q&A indicates the gasket is included

Specifications

Most in-stock items ship within 1–3 business days. Once shipped, you will receive a confirmation email with tracking. Special-order items or items shipped from partner warehouses may require additional processing time. Orders ship via UPS or USPS depending on the item and destination. If you need a specific carrier, please contact us before placing your order.