Backventiler

NON RETURN VALVE GA 015, GB 015, GB 019 – Little dimensions and low weights. Face to face acc.to DIN EN 558-1 Series 49 (DIN 3202 K4). Opening pressure from 20 to 500 mBar. Usable also as vacuum breacker, overpressure and bottom valve. No leackage with soft seat and acc.to DIN 3230 BN3 with metal seat. Low head losses.

Type CD/F A flanged check valve incorporating the basic cone and diaphragm assembly housed in a flanged cast iron body BS 1452 grade 17 (ASTM equivalent 48 Gr.35). Available in the size range 40 mm (1.5 in) to 200 mm (8 in) diameter with flanges to BS 4504 NP 16 or equivalent. Fabricated steel bodies are available as an option. Diaphragms to suit application.

Type CD/WF Essentially for ‘foot valve’ applications where single flange bolting to the end of a pipe is necessary. May also be used for bolting to the sides of tanks or bulkheads. Size range 40 mm (1.5 in) to 200 mm (8 in). Note: Type CD/WF valve should not be used for clamping between adjacent pipe flanges. The first choice for that application should be type CD.

Type CD/M For large bore installations we offer the Norval valve in modular form, in sizes 250 mm – 600 mm diameter. These check valves are constructed by mounting a number of small cone diaphragm assemblies onto a centre plate which is housed in a mild steel fabricated body. The number and size of the individual Norval cone is determined by the flow requirements. By using one of our standard mounting plates and fabricated ends, a permutation to meet all requirements can be achieved. If required, a hand hole cover can be incorporated in the body.

Type CD This check valve comprises an integral increased flange cone in stainless steel 316 type and is available in the size range 40 mm (1.5 in) to 200 mm (8 in) diameter for mounting between adjacent pipe flanges to BS 4504 NP 16 or equivalent. Cone and diaphragm assemblies are also available in nominal 25 mm (1 in) and 32 mm (1.25 in) diameters but are not normally suitable for bolting between standard flanges. A choice of diaphragms is available to suit your application.

Type CD/S A screwed pattern check valve incorporating the basic cone and diaphragm assembly with a specially reduced diameter flange in a two piece bronze body to SS 1400- LG2C (ASTM equivalent B 145-836). End connections screwed 15 mm (1/2 in) to 50 mm (2 in) BSP. Also available in 316 stainless.

Type CIP – RJT or IDF Connections For many years the Norval Non-Return principle has been very successful throughout most industrial sectors. During discussions with engineers in the Brewing, Soft drinks and Food Industries we established that the Norval principle could be developed to overcome problems encountered with Non-Return Valves in CIP systems. Today we are also able to utilise customers existing CIP components together with the Norval Cone & Diaphragm maximising operational flexibility and asset value.

Type CD/S Plastic A new plastic body is now available to house our unique Norval Check Valve. This is available in sizes ½” to 2″ and can be supplied with screwed BSP end connections or with push fit ends for easy and quick installation. This is a very lightweight and cost effective solution to customers’ needs and is especially in popular in the chemical industries and water authorities. Where stainless steel is not suitable or cannot be used the cone can be manufactured in PTFE.

CHECK VALVE FEATURES THAT THE PIPING ENGINEER IS LOOKING FOR.    * Tight shut off under minimum back pressure. * Quick response to no-flow or reverse flow conditions. Low resistance to forward flow. * Lightweight construction. * Ease of installation with unskilled operators. * No maintenance. It is a stop silent valve. * It stops the reverse flow and is completely silent in its operation, preventing water hammer.

RT25 The RT25 all stainless steel disc check valves have a compact design and were specially designed for use with steam and hot condensate. MATERIAL: Stainless steel SIZES: 1/4” – 2” CONNECTIONS: Threaded ISO 7 Rp MAX. OPERATING PRESSURE: 21 bar MAX. OPERATING TEMPERATURE: 220 ºC

Teknisk prestanda: Full borrning säkerställdes Självrengörande boll, Lågt tryckfall Avtagbart lock för rengöring eller byte av bollen utan demontering ur rörledningen Horisontell och vertikal installation i rörledningen

Teknisk prestanda:
Full borrning säkerställdes
Självrengörande boll, Lågt tryckfall
Avtagbart lock för rengöring eller byte av bollen utan demontering ur rörledningen
Horisontell och vertikal installation i rörledningen

Teknisk prestanda:
Full borrning säkerställdes
Självrengörande boll, Lågt tryckfall
Avtagbart lucka för rengöring eller byte av bollen utan demontering ur rörledningen
Horisontell och vertikal installation i rörledningen

T113AR Spjällbackventil  Backventilen har snedställd klaff och säte. Detta ger korta stängningstider. Klaffen är upphängd mellan två axeltappar. Ventilen är metalliskt tätande. I ventiler med fjäderbelastad klaff  stänger ventilen innan mediaströmmen vänder. Detta minskar risken för tryckslag. Lågt tryckfall och öppningstryck. Snabbverkande. Ventilens montering kan göras antingen horisontellt eller vertikalt, det beror på installationsstrukturen. Ventilen är metalliskt tätande (lämplig för applikationer där absolut täthet inte är nödvändig). Lämplig för alla standardflänsar. Snabb stängningsreaktion. Utmärkt täthet (läckage 0,1 mm3 x DN med vatten). Riktnings pil i kroppen som visar korrekt monteringsposition. För höga prestanda och tryck upp till PN40

Spjällbackventil 2646-2646F Backventilen har snedställd klaff och säte. Detta ger korta stängningstider. Klaffen är upphängd mellan två axeltappar. Ventilen har tät svetsade axlar som eliminerar risken för medialäckage till omgivningen. Ventilen är metalliskt tätande. I ventiler med fjäderbelastad klaff (2646F, endast fr.om. DN80) stänger ventilen innan media strömmen vänder. Detta minskar risken för tryckslag. Tekniska data Flödesriktning: Enkelriktad Material: Rostfritt stål Material: Syrafast stål 316 (1.4408) Temperatur (C°): -40 - +400 Tryckklass (PN): 10 - 63 Anslutning: Flänsad EN1092 Montageposition: Vertikal, Horisontell Montageposition notering: Vertikalt montage endast möjligt vid stigande flöde. ETIM klassning: EC010596 - Backventil för inspänning