All versions supplied with a replaceable membrane meaning the vessel can be serviced without being removed.

Range of vertical expansion vessels with EPDM (VBV500, VBV750, VBV1000, VBV1500) or butyl (VBV2000, VBV3000, VBV4000, VBV5000) membrane and stainless-steel flange connections.This includes claims for hours lost whilst replacing faulty items or testing to ascertain if the product we have supplied is actually faulty. I’ve isolated the vessel and opened Hot/Cold valves downstream and opened a hot/cold tap to relieve water pressure. The vessel itself is constructed with an internal membrane that prevents water from coming into contact with the steel housing, easily replaced without dismounting the vessel. All vessels are supplied with a replaceable membrane, which separates the water and air, to prevent contamination of the water system, corrosion of the pressure vessel or pressure loss in the water system. We would always recommend that any work carried out following information or advice we have provided is done so by a fully qualified engineer.

The main purpose of an expansion vessel is to compensate for the increase in volume of water due to the varying water temperatures in hot water or heating systems. We will where possible provide technical advice to determine if there is a potential fault with your system. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.Section: 1000 Expansion Vessels WRAS Approval Number: 2103337 Expiry date: 31/03/2026 Note: Expansion vessels should be installed in the vertical orientation and located so as to minimise the length of any connecting pipework. Due to the pressure from the pressurised air surrounding the membrane, water will start to exit the vessel until the membrane is deflated. I would appreciate a second opinion as to whether this would be a suitable replacement for a sealed system.

You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. Reliance Valves Aquasystem Replacement Vessel Membranes are available from 2 to 5000 litre capacity, which allows the vessel to be serviced in situ and prevents any water contact with the steel shell to prevent internal corrosion. Finance is provided by PayPal Credit (a trading name of PayPal UK Ltd, Whittaker House, Whittaker Avenue, Richmond-Upon-Thames, Surrey, United Kingdom, TW9 1EH). This site uses cookies that enable us to make improvements, provide relevant content, and for analytics purposes. At this point the membrane is back to its initial dimensions, the pump starts again and a new cycle begins.

So happy with the speed this was dispatched because of reduced water capacity in my property due the defective old one. Attached bicycle pump but when I try add air it feels like there’s a big back pressure preventing me from adding air. If you receive goods that are damaged, not required or not what you were expecting please contact us using the procedures shown in this section. I have come across a EV where the membrane was stuck hard up against the schrader valve and I removed it from the water end and then replaced (same one) it back in the EV and had no problem pre charging it then. With a range of sizes available from 2l to 25l, these vessels come with a pre-charge valve for topping up air pressure and are WRAS approved.