{"product_id":"22mm-automatic-bypass-valve-adjustable-differential-pressure-boiler-bypass-trv-heating-systems","title":"22mm Automatic Bypass Valve — Adjustable Differential Pressure Boiler Bypass TRV Heating Systems","description":"\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\n  \u003c!-- ── INTRO ─────────────────────────────────────────────────────── --\u003e\n  \u003cp style=\"margin:0 0 18px;\"\u003e\n    The \u003cstrong\u003eTower ABBV1\u003c\/strong\u003e is a \u003cstrong\u003e22mm angled automatic differential bypass valve\u003c\/strong\u003e for sealed central heating systems, designed to maintain a minimum flow rate through the boiler whenever thermostatic radiator valves (TRVs) or zone valves close down. Installed in a loop between the heating flow and return, the ABBV1 opens automatically when system differential pressure rises to the set point — routing water through the bypass and preventing the pump from circulating against a closed or near-closed circuit. The \u003cstrong\u003eadjustment dial sets the opening pressure from 0.1 to 0.6 bar\u003c\/strong\u003e and locks in place with a screw, giving the installer precise control matched to the system's pump curve. Maximum flow capacity is \u003cstrong\u003e50 litres per minute\u003c\/strong\u003e, suitable for the full range of domestic sealed heating systems.\n  \u003c\/p\u003e\n\n  \u003c!-- ── STAT STRIP ─────────────────────────────────────────────────── --\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003e22mm\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eCompression — angled\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003e0.1–0.6 bar\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eAdjustable \u0026amp; lockable\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003e50 L\/min\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eMax flow capacity\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003eAutomatic\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eNo electrical connection\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ── TEAL INSTALL CALLOUT ───────────────────────────────────────── --\u003e\n  \u003cdiv style=\"border-left:4px solid #008377CF;background:#e6f4f3;padding:10px 16px;margin-bottom:22px;border-radius:0 6px 6px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eℹ Installation Position\u003c\/strong\u003e\u003cbr\u003e\n    Fit the ABBV1 in a \u003cstrong\u003eloop between the flow and return pipework, after the pump\u003c\/strong\u003e. Flow must enter in the direction of the arrow marked on the valve body. For most domestic installations the valve is sited adjacent to the boiler or in the airing cupboard, bridging between two parallel 22mm pipework runs. The angled configuration (90° ports) means no additional bends are needed where the flow and return run parallel and close together.\n  \u003c\/div\u003e\n\n  \u003c!-- ── FEATURES GRID ──────────────────────────────────────────────── --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003e\n    Features \u0026amp; Benefits\n  \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\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✔ Adjustable 0.1–0.6 Bar — Lockable Dial\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eA visual numbered dial adjusts the bypass opening differential pressure from \u003cstrong\u003e0.1 to 0.6 bar\u003c\/strong\u003e. Once set, a screw on top of the adjuster locks the position — preventing accidental drift after commissioning. A setting of 0.2–0.3 bar suits most domestic systems; the correct value should match the boiler manufacturer's minimum flow requirement and the system's pump curve. The wider 0.6 bar upper range makes the ABBV1 suitable for higher-head pump systems where a standard bypass valve would open prematurely.\u003c\/div\u003e\n    \u003c\/div\u003e\n\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 the Boiler Heat Exchanger\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eModern condensing boilers — especially those with compact plate heat exchangers — require a \u003cstrong\u003eminimum flow rate at all times\u003c\/strong\u003e, regardless of how many radiators are calling. When TRVs close down as rooms reach temperature, flow restriction rises sharply. The ABBV1 opens to divert enough flow to satisfy this minimum requirement, preventing localised overheating, kettling, and the premature PRV trips that result from high static pressure in a closed circuit.\u003c\/div\u003e\n    \u003c\/div\u003e\n\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 the Pump — Eliminates Noise\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eA pump running against a closed head creates high differential pressure, causes impeller wear, and generates pipe noise — the familiar banging or high-pitched hum when TRVs close. The ABBV1 opens \u003cstrong\u003eprogressively as pressure builds\u003c\/strong\u003e, maintaining a stable system pressure and eliminating the pressure spikes that propagate as noise through pipework. Pump life is extended by avoiding the closed-head condition entirely.\u003c\/div\u003e\n    \u003c\/div\u003e\n\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✔ 50 L\/min — High Capacity for Any Domestic System\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eWith a \u003cstrong\u003emaximum flow capacity of 50 litres per minute\u003c\/strong\u003e, the ABBV1 handles the bypass demand of any standard domestic sealed heating system, including those with high-output boilers or multiple zone valves. This capacity significantly exceeds simpler spring-loaded bypass valves, ensuring the bypass can carry adequate flow even when several zones close simultaneously.\u003c\/div\u003e\n    \u003c\/div\u003e\n\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✔ 22mm Compression — No Soldering\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eStandard \u003cstrong\u003e22mm compression fittings\u003c\/strong\u003e allow installation on existing copper pipework without a blowtorch — suitable for retrofit on occupied premises, gas-purged areas, or anywhere open flame is not permitted. The compression joints can be remade without cutting the pipework, simplifying future access or replacement.\u003c\/div\u003e\n    \u003c\/div\u003e\n\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✔ Pump Overrun Support\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eMany boiler controllers run the pump for a short overrun period after the burner shuts off — to extract residual heat from the heat exchanger. During this overrun, if zone valves have already closed, the pump has no circuit to circulate through. The ABBV1 provides the bypass path needed for \u003cstrong\u003epump overrun to complete correctly\u003c\/strong\u003e, preventing the pressure lockouts that can occur when a pump overruns into a sealed-off system.\u003c\/div\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ── SPEC TABLE ─────────────────────────────────────────────────── --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003e\n    Technical Specifications\n  \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;\"\u003eManufacturer \/ Part No.\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eTower (TFC Group) — \u003cstrong\u003eABBV1\u003c\/strong\u003e\n\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;\"\u003eAngled (90° inlet\/outlet)\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;\"\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:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eDifferential Pressure Range\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\n\u003cstrong\u003e0.1 – 0.6 bar\u003c\/strong\u003e (adjustable and lockable)\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;\"\u003eMax Flow Capacity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003e50 litres\/minute\u003c\/strong\u003e\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;\"\u003eOperation\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eAutomatic differential pressure — no electrical connection required\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;\"\u003eSetting\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eVisual numbered dial — lockable via screw on adjuster\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;\"\u003eApplications\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eSealed CH systems with TRVs; boiler bypass; zone valve systems; pump overrun protection\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e","brand":"Tower TFC Group","offers":[{"title":"Default Title","offer_id":64134446776669,"sku":"ABBV1","price":22.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/AutomaticByPassValve22mmabbv1.jpg?v=1775745847","url":"https:\/\/qualityheating.co.uk\/products\/22mm-automatic-bypass-valve-adjustable-differential-pressure-boiler-bypass-trv-heating-systems","provider":"AIZO Quality Heating","version":"1.0","type":"link"}