{"product_id":"differential-by-pass-valve-22mm","title":"Differential by-pass valve 22mm","description":"\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003carticle class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"568a3cfc-2f4b-45ce-9cbb-ca6a77fa99f5\" data-testid=\"conversation-turn-428\" data-scroll-anchor=\"true\" data-turn=\"assistant\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"f990fe2f-86cc-4932-a2e8-0866352afecf\" dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-2\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full break-words light markdown-new-styling\"\u003e\n\u003cp data-start=\"23\" data-end=\"326\"\u003eA \u003cstrong data-start=\"25\" data-end=\"61\"\u003e22 mm Differential By-Pass Valve\u003c\/strong\u003e is a control component used in central heating systems to regulate water flow and pressure between the flow and return pipes. It helps maintain stable operation when parts of the system restrict flow, such as when thermostatic radiator valves or zone valves close.\u003c\/p\u003e\n\u003ch3 data-start=\"328\" data-end=\"352\"\u003eFunction \u0026amp; Purpose\u003c\/h3\u003e\n\u003cp data-start=\"353\" data-end=\"726\"\u003eThe valve automatically opens when the pressure difference between the flow and return exceeds a set level, allowing water to bypass the main heating circuit. This prevents excessive pressure build-up, reduces noise, protects the circulation pump and boiler, and helps maintain consistent flow through the system. When pressure drops back to normal, the valve closes again.\u003c\/p\u003e\n\u003ch3 data-start=\"728\" data-end=\"747\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp data-start=\"748\" data-end=\"1065\"\u003eThis valve is designed for \u003cstrong data-start=\"775\" data-end=\"793\"\u003e22 mm pipework\u003c\/strong\u003e, making it suitable for most domestic and light commercial central heating systems that use this pipe size. It works with combi, system, and conventional boilers and is commonly installed near the boiler, pump, or manifold where pressure changes are most likely to occur.\u003c\/p\u003e\n\u003ch3 data-start=\"1067\" data-end=\"1091\"\u003eIdeal Applications\u003c\/h3\u003e\n\u003cp data-start=\"1092\" data-end=\"1443\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eA 22 mm differential by-pass valve is ideal for heating systems with multiple radiators fitted with TRVs, systems using zone valves, or installations where pressure-related noise or pump strain has been an issue. It is particularly useful in modern systems that frequently experience partial flow restriction and require stable, protected circulation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e","brand":"Plumbparts xpress","offers":[{"title":"Default Title","offer_id":57056153862489,"sku":"70065608","price":8.39,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/9738\/1209\/files\/70065608.jpg?v=1768911607","url":"https:\/\/plumbpartsxpressshop.com\/products\/differential-by-pass-valve-22mm","provider":"Plumbparts xpress","version":"1.0","type":"link"}