The Mut Meccanica Anti Freeze 1 Inch Swivel is an automatic anti‑freeze safety valve with a 1″ swivel union connection, designed to protect external heat pump primary circuits from frost damage. It mounts directly to the back of a monobloc heat pump and discharges water if the circuit temperature approaches freezing, helping prevent burst pipework and expensive repairs.

Key Features

• 1″ swivel union connection – 1″ union fitting with 1″ male BSP thread allows the valve to be fitted directly onto the back of a compatible air source heat pump for a neat, compact installation.
• Automatic freeze protection – opens automatically when the internal sensing element detects water temperature close to freezing, dumping water to protect the circuit without needing power.
• Visual open indicator – integrated visual aid clearly shows when the valve has opened, making it easy to spot frost events during checks and servicing.
• Heat‑pump focused design – specifically suited to monobloc ASHP primary circuits where external pipework and components are exposed to low ambient temperatures.
• Robust MUT construction – Italian‑made valve from Mut Meccanica, engineered for long‑term reliability in demanding heating and renewable applications.

Technical Overview

• Product code: 7.030.03576‑01 (Mut Meccanica Anti Freeze 1″ Swivel).
• Connections: 1″ BSP male outlet with 1″ swivel union for direct mounting to heat pump hydraulic ports.
• Function: temperature‑sensing anti‑freeze discharge valve for water‑based or glycol‑mixed primary circuits.
• Medium: heating system water or suitable water/glycol mix within the valve’s specified operating range.
• Typical use: external, low‑level mounting on monobloc ASHP pipework where passive, power‑free frost protection is required.

Applications

• Monobloc heat pumps – primary protection for the external hydraulic block and exposed flow/return pipework in freezing conditions or power outages.
• Exposed pipe runs – ideal for installations with long or partially exposed primary pipework, adding a safety layer beyond standard control‑based frost protection.
• Enhanced system protection – can be used alongside inhibited glycol solutions and insulation to create a belt‑and‑braces approach on high‑value systems.

Installation Notes

• Mount the valve as close as possible to the heat pump connection using the 1″ swivel union, orienting the body so the discharge port points to a safe drainage area.
• Pipe or direct the discharge to a suitable drain or area where intermittent water discharge and ice formation will not cause hazards or damage.
• Ensure the sensing portion is exposed to realistic system and ambient conditions and remains accessible so the visual indicator can be checked during maintenance.