The Drayton TRV4 Chrome 15mm Angled TRV & Lockshield Pack (MPN 07 05 174) is a fully chrome-matched radiator valve pair for premium and designer heating installations. The pack combines a 15mm angled TRV4 body with chrome liquid-filled sensing head and a matching chrome lockshield — creating a consistent all-chrome finish suited to exposed pipework, bathroom heated towel rails, period-style interiors, and chrome column radiators. The TRV4 Chrome carries the TELL Class I energy efficiency rating, the same as the Classic variant, and is approved to BS EN 215.
Reverse Flow
Body Feature
Full Chrome Match
Both the TRV sensing head and the lockshield cap are chrome finish, providing a co-ordinated look at both ends of the radiator — ideal for bathrooms, heated towel rails, and designer radiator installations where aesthetics matter.
System Commissioning
Flush to BS7593 before commissioning and dose with inhibitor. Maintain differential pressure below 0.2 bar for quiet operation — use a Drayton DTB by-pass valve where required.
Key Features
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All-Chrome Finish
Both the TRV head and the lockshield body/cap are chrome — no mismatched white plastic at either end of the radiator. Particularly suited to bathrooms, ensuites, and visible pipework runs.
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Class I Efficiency Rating
The TRV4 Chrome holds the TELL Class I energy efficiency rating — unlike the Anthracite variant, Chrome is rated the same as Classic, covering response speed, setpoint accuracy, and pressure/temperature stability.
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Reverse Flow Angled Body
Installs on flow or return with the head vertical or horizontal — the same flexible reverse-flow design found across the TRV4 range.
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Double Gland Seal
Prevents leakage and allows the chrome sensing head to be removed without draining the system — minimising downtime and disruption for head replacement in occupied properties.
Technical Specifications
| MPN |
07 05 174 |
| Also Available (straight pack) |
07 05 175 |
| Chrome TRV Only (boxed) |
07 05 150C (angled); 07 05 151C (straight) |
| Chrome Head Only |
07 03 013 |
| Finish |
Full Chrome (head + lockshield) |
| Connection |
15mm compression (BS EN 1254-2); ½" BSP radiator thread (BS EN 10226) |
| Body Material |
Chrome-plated brass |
| Setting Range |
Approx. 10°C – 30°C (1–5 + MAX) |
| Frost Protection |
Below 8°C (marked *) |
| Max Flow Temperature |
110°C |
| Max Sensor Temperature |
50°C |
| Max Test Pressure |
20 bar |
| Max Static Pressure (compression) |
10 bar at 65°C; 6 bar at 110°C |
| Sensor Sensitivity |
0.22 mm/°C |
| Hysteresis |
0.4 K |
| Energy Efficiency Rating |
TELL Class I |
| Standard |
BS EN 215 / Keymark (valid to 31.03.2029) |
| Manufacturer |
Drayton by Schneider Electric |
Frequently Asked Questions
Does TRV4 Chrome carry the same Class I rating as Classic?
Yes — unlike TRV4 Anthracite, the TRV4 Chrome carries the full TELL Class I energy efficiency certification, the same as TRV4 Classic and White.
Can I buy just the chrome sensing head to retrofit onto an existing TRV4 body?
Yes — MPN 07 03 013 is the TRV4 Chrome sensing head sold separately. It fits all TRV4 valve bodies (not TRV3).
What is the difference between 07 05 174 and 07 05 150C?
07 05 174 is the complete chrome pack including both the chrome TRV and a matching chrome lockshield. 07 05 150C is the chrome TRV body and head sold individually (no lockshield).
Is this pack appropriate for a heated towel rail?
Yes — the chrome finish is ideal for bathroom towel rails. Ensure the towel rail's radiator connections are standard ½" BSP female. Also check that the towel rail is correctly sized for the room heat load, as TRVs cannot compensate for an undersized emitter.
Is there a straight-body chrome pack?
Yes — MPN 07 05 175 is the straight 15mm chrome TRV and chrome lockshield pack for inline pipe configurations.
