{"product_id":"automatic-bypass-valve-22mm-angled-and-straight-central-heating-bypass-for-trv-systems","title":"Automatic Bypass Valve 22mm Angled and Straight — Central Heating Bypass for TRV Systems","description":"\u003c!-- SEO Product Name: Automatic Bypass Valve 22mm BPV100 Angled BPV100S Straight — Central Heating Bypass for TRV Systems --\u003e\n\u003cdiv style=\"font-size:16px;font-family:Arial,Helvetica,sans-serif;color:#1a1a1a;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n  \u003cp style=\"margin:0 0 18px;\"\u003e\n    The \u003cstrong\u003eBPV100 \/ BPV100S Automatic Bypass Valve\u003c\/strong\u003e is a \u003cstrong\u003epressure-operated bypass valve for 22mm central heating pipework\u003c\/strong\u003e, designed to maintain a minimum flow rate through the boiler when thermostatic radiator valves (TRVs) close down. Available in two configurations: \u003cstrong\u003eBPV100 (angled)\u003c\/strong\u003e — for fitting between parallel flow and return connections at a corner — and \u003cstrong\u003eBPV100S (straight)\u003c\/strong\u003e — for in-line fitting on a straight pipework run. The valve \u003cstrong\u003eopens automatically when system differential pressure rises\u003c\/strong\u003e beyond the set point, routing water through the bypass to prevent the boiler from firing against a closed or near-closed circuit. This eliminates pump noise, reduces system pressure spikes, and protects the boiler heat exchanger — all without any electrical connection or programmer input.\n  \u003c\/p\u003e\n  \u003cdiv style=\"border-left:4px solid #f59e0b;background:#fff8e1;padding:10px 16px;margin-bottom:22px;border-radius:0 6px 6px 0;\"\u003e\n    \u003cstrong style=\"color:#b45309;\"\u003e⚡ BPV100 vs BPV100S — Which to choose?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eBPV100 (angled):\u003c\/strong\u003e The inlet and outlet ports are at 90° to each other — ideal for fitting between the flow and return where the pipes run along parallel walls, or in a tight corner adjacent to the boiler. This is the most commonly used configuration.\u003cbr\u003e\n    \u003cstrong\u003eBPV100S (straight):\u003c\/strong\u003e The inlet and outlet are in-line — for fitting on a dedicated bypass spur connected in parallel between a straight section of the flow and return pipework. Used where the flow and return run alongside each other and a short cross-connection bridge is required.\n  \u003c\/div\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003eFeatures \u0026amp; Benefits\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:12px;background:#e6f4f3;padding:14px;border-radius:0 0 6px 6px;margin-bottom:22px;\"\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Pressure-Operated — No Electrical Connection\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe BPV100 is \u003cstrong\u003eentirely mechanical\u003c\/strong\u003e — it responds to the actual differential pressure in the system and opens or closes accordingly. There is no wiring, no controls interface, no programmer setting required. It operates correctly regardless of boiler type, control strategy, or zone configuration, making it straightforward to specify and install in any domestic or light commercial CH system.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Protects Boiler Heat Exchanger\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eMany boiler manufacturers specify a \u003cstrong\u003eminimum flow rate through the heat exchanger\u003c\/strong\u003e regardless of system load — if all TRVs close simultaneously, the pump circulates water around a closed circuit, pressure rises sharply, flow drops to near zero, and the heat exchanger overheats. The BPV100 prevents this by providing a bypass path that maintains flow. This is a warranty-critical requirement for many modern condensing boilers, particularly those with small-volume primary heat exchangers.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Eliminates System Noise from TRVs\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eAs TRVs close down, the increased flow resistance can cause \u003cstrong\u003epipe noise, kettling, and pump whine\u003c\/strong\u003e. The BPV100 opens progressively as pressure rises, maintaining a stable system pressure and preventing the pressure surges that cause noise in pipework and boiler components. For end-users, this is often the most immediately noticeable benefit of installation.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Compact — Easy to Retrofit\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eAt \u003cstrong\u003e105 × 50 × 20mm\u003c\/strong\u003e, the BPV100 is slim enough to fit in tight spaces adjacent to the boiler, in airing cupboards, or on manifold pipework. Standard 22mm compression fittings mean no specialist tools or pipe preparation beyond a standard compression fitting — suitable for retrofit on existing systems without draining down provided isolation valves are present.\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;margin-bottom:8px;font-size:14px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;width:44%;border-bottom:1px solid #c8e6e3;\"\u003ePart Numbers\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\n\u003cstrong\u003eBPV100\u003c\/strong\u003e (angled) \/ \u003cstrong\u003eBPV100S\u003c\/strong\u003e (straight)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eConnection Size\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e22mm compression\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eOperation Type\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003ePressure-operated (no electrical connection)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eConfiguration\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eBPV100: angled (90° inlet\/outlet) · BPV100S: straight (in-line)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eApplication\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eCH systems with TRVs; boiler bypass; zone valve systems\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eDimensions (W × H × D)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e105 × 50 × 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e","brand":"ProXHeat","offers":[{"title":"Angled","offer_id":64133359436125,"sku":"BPV100","price":13.0,"currency_code":"GBP","in_stock":true},{"title":"Straight","offer_id":64133359468893,"sku":"BPV100S","price":13.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/AutomaticBypassValve22mmAngledbpv100s.jpg?v=1775738996","url":"https:\/\/qualityheating.co.uk\/products\/automatic-bypass-valve-22mm-angled-and-straight-central-heating-bypass-for-trv-systems","provider":"AIZO Quality Heating","version":"1.0","type":"link"}