The Caleffi F69590 is the replacement shut-off valve for the return manifold of Caleffi 668S1-series TwistFlow assemblies - the per-loop valve that isolates a circuit and accepts a TwisTop thermo-electric actuator.
Product data compiled from Caleffi North America technical documentation (01170 NA, 68367, NA11012, SS-103 NA) and the Caleffi North America product catalogue. Last reviewed August 2026.
Key Features
Return-Manifold Shut-Off Valve
Replaces a per-loop shut-off valve on the 668S1 return manifold, restoring positive isolation of a single circuit.
Actuator-Ready
Accepts a Caleffi TwisTop thermo-electric zone actuator in place of the manual knob, so zoning is retained after service.
No Manifold Replacement
Service the affected loop in place instead of replacing the return manifold body.
Technical Data
| Function | Manifold / mixing station service part |
|---|---|
| Part | Shut-off valve, 668S1 return manifold |
| Fits | Caleffi 668S1 series manifolds (including the return manifold of 172-series mixing stations, which use the same manifold - confirm with your rep) |
Related Products
Frequently Asked Questions
A per-loop shut-off valve on the return manifold of a 668S1-series TwistFlow assembly. For the supply-side balancing flow meter, order F69600 instead.
If a loop's shut-off will not close fully, leaks at the stem, or no longer seats an actuator correctly.
- Type:
- Accessory
