pressure reducing valves The function of a pressure reducing valve A pressure reducing valve is installed in-line. It is responsible for maintaining the downstream line pressure to the pressure set at the valve. The valve works by responding to changes in the downstream pressure. For example, assume that there are normally two open valves downstream from the pressure regulator. When one is closed, the back pressure will increase. As this happens, the pressure reducing valve would close down to maintain the downstream pressure. When the valve is re-opened the pressure reducing valve would also open up again until the set pressure was reached. Under operating conditions the pressure reducing valve is always open which means that it is balanced between the inlet pressure (primary side) and the lower outlet/working pressure. At any rise of working pressure at the valve outlet a pressure compensation via the control bore takes place at the area below the diaphragm. The higher working pressure activates the large diaphragm and lifts the piston against the spring force. The flow reduces and the working pressure drops until the balanced condition is reached again. When the working pressure drops this procedure is reversed. The spring force opens the valve seat against the lower pressure force below the diaphragm. The flow rises until the balanced condition is reached again. Pre-setting or re-adjustment of the valve set pressure is made by removing the protective cap and by setting the control screw. The counter nut is tightened after final adjustment. When used with neutral fluids, many of the pressure reducing or relief valves can be fitted with a pressure gauge if required. Applications for Pressure Reducing Valves 144
pressure reducing valves ASV Stubbe Type 755 Pressure Reducing Valve Description: In-line adjustable valve used to reduce system pressures and to keep the working pressure constant Pressure Setting Range: 1 to 9 bar Hysteresis: Approx. 0.1 to 0.4 bar End Connections: Union solvent sockets or solvent cement spigots Features: Adjustable at any time, even during use. Constant pressure control to ± 0.2 bar. Vibration free during operation. Installation is independent of flow direction. Options: A pressure gauge can be fitted on the primary or also on the secondary side. Setting Range - 1 to 9 bar 1/2 1193 01 /1 316.05 1/2 1193 08 /1 316.05 3 /4 1193 02 /1 412.77 3 /4 1193 09 /1 412.77 1 1193 03 /1 417.43 1 1193 10 /1 417.43 1 1 /4 1193 04 /1 510.76 1 1 /4 1193 11 /1 532.62 1 1 /2 1193 05 /1 520.13 1 1 /2 1193 12 /1 545.09 2 1193 06 /1 529.54 2 1193 13 /1 558.24 16 1193 00 315.39 20 1193 01 331.40 25 1193 02 420.88 32 1193 03 425.63 40 1193 04 520.83 50 1193 05 530.37 63 1193 06 539.96 16 1193 07 330.33 20 1193 08 332.80 25 1193 09 433.58 32 1193 10 439.04 40 1193 11 543.09 50 1193 12 555.83 63 1193 13 569.23 16 1220 48 303.72 20 1220 49 303.72 25 1220 50 399.46 32 1220 51 399.46 40 1220 52 489.86 50 1220 53 489.86 63 1220 54 489.86 16 1220 55 316.12 20 1220 56 316.12 25 1220 57 414.46 32 1220 58 414.46 40 1220 59 510.55 50 1220 60 510.55 63 1220 61 510.55 145
pressure reducing valves ASV Stubbe Type 765 Pressure Reducing Valve Description: In-line adjustable valve used to reduce system pressures and to keep the working pressure constant Pressure Setting Range: 0.5 to 9 bar Hysteresis: Approx. 0.1 to 0.4 bar End Connections: Union solvent sockets or solvent cement spigots Features: Adjustable at any time, even during use. Constant pressure control to ± 0.2 bar. Vibration free during operation. Installation is independent of flow direction. Options: A pressure gauge can be fitted on the primary or also on the secondary side. Setting Range - 0.5 to 9 bar 1/2 1193 43 /1 339.52 1/2 1193 50 /1 349.72 3 /4 1193 44 /1 441.58 3 /4 1193 51 /1 453.88 1 1193 45 /1 444.64 1 1193 52 /1 457.95 1 1 /4 1193 46 /1 534.91 1 1 /4 1193 53 /1 556.76 1 1 /2 1193 47 /1 543.63 1 1 /2 1193 54 /1 568.43 2 1193 48 /1 550.44 2 1193 55 /1 579.41 16 1193 42 338.73 20 1193 43 339.52 25 1193 44 463.01 32 1193 45 444.64 40 1193 46 545.42 50 1193 47 554.34 63 1193 48 561.29 16 1193 49 354.14 20 1193 50 356.60 25 1193 51 462.83 32 1193 52 466.96 40 1193 53 567.72 50 1193 54 579.63 63 1193 55 590.80 16 1220 90 327.85 20 1220 91 327.85 25 1220 92 427.48 32 1220 93 427.48 40 1220 94 513.19 50 1220 95 513.19 63 1220 96 513.19 16 1220 97 339.76 20 1220 98 339.76 25 1220 99 443.03 32 1221 00 434.47 40 1221 01 523.23 50 1221 02 523.23 63 1221 03 523.23 146
pressure reducing valves ASV Stubbe Type 750 Pressure Reducing Valve Description: In-line adjustable valve used to reduce system pressures and to keep the working pressure constant Pressure Setting Range: 1 to 6 bar Hysteresis: Approx. 0.1 to 0.4 bar End Connections: Solvent cement spigots Features: Adjustable at any time, even during use. Constant pressure control to ± 0.2 bar. Installation is independent of flow direction. Setting Range - 1 to 6 bar 75 1111 73 1542.99 90 1111 74 3664.83 Valve Tags We manufacture laminated plastic or stainless steel valve tags to order. Laminated Plastic 38mm Diameter engraved one side Code: LAMTAG38 Price: 4.02 38mm Diameter engraved two sides Code: LAMTAG 38/2 Price: 4.82 50mm Diameter engraved one side Code: LAMTAG 50 Price: 4.02 50mm Diameter engraved two sides Code: LAMTAG 50/2 Price: 4.82 Stainless Steel Rectangular tag engraved one side Code: S.S.TAG Price: 4.23 Don t know how to use a product? Give our expert team a call: 0800 975 79 71 Or from outside of the UK: +44 191 521 3111 147
pressure relief valves The function of a pressure relief valve A pressure relief valve is most often used to protect a system from overpressurisation, but it can also be used to maintain a constant upstream pressure or even as a non-return valve in certain installations. Not normally installed as an in-line valve, it only opens when the system pressure exceeds the pressure set against the diaphragm of the valve. When this happens, the excess pressure forces the valve piston off its seat, compressing the spring and allowing fluid to flow through the valve body to discharge. Damping at the valve piston suppresses vibration and fluttering. The pre-formed diaphragm allows full opening of the valve whilst separating the fluid in the lower body from the bonnet and therefore the atmosphere. The seal is additionally secured by crimped seal O-rings at the diaphragm. When the system pressure falls back to below the set pressure, the spring forces the piston back into the seat, closing the valve. Pre-setting or re-adjustment of the valve set pressure is made by removing the protective cap and by setting the control screw. The counter nut is tightened after final adjustment. When used with neutral fluids, many of the pressure relief valves can be fitted with a pressure gauge if required. Applications for Pressure Relief Valves 1. Constant system pressure 2. Consumer 1 and /or 2 opens, pressure relief valve closes 3. Pressure relief valve as backflow preventer 4. Pressure relief valve as overflow valve: The container pressure or system must not exceed the max. pressure value X = valve opens Y = valve closed pmax = max. pressure pa = working pressure pp = pump pressure pö = opening pressure 148
pressure relief valves ASV Stubbe Type 712-R Pressure Relief and Non-Return Valve Description: Adjustable pressure relief and overflow valve, back-pressure safe Pressure Setting Range: 0.3 to 10 bar Opening Pressure: Approx. 0.3-0.5 bar Hysteresis: Approx. 0.3 bar End Connections: Union solvent sockets or solvent cement spigots Features: Unique design: valve acts as a non-return valve if there is no pressure on the inlet side. Adjustable at any time, even during use. Vibration free during operation. Maintenance free. High reproducability, low hysteresis. Options: A pressure gauge can be fitted on the primary or also on the secondary side. Setting Range - 0.3 to 10 bar 3 /8 146414 179.45 3 /8 146422 181.40 1 /2 146415 190.08 1 /2 146423 197.11 3 /4 146416 265.31 3 /4 146424 287.22 1 146417 271.73 1 146425 289.66 1 1 /4 146418 338.86 1 1 /4 146426 363.41 1 1 /2 146419 350.58 1 1 /2 146427 377.96 2 146420 362.66 2 146428 393.28 16 146350 191.75 20 146351 193.82 25 146352 270.54 32 146353 277.08 40 146354 345.52 50 146355 357.48 63 146356 369.80 16 146366 196.37 20 146367 201.00 25 146368 279.31 32 146369 289.66 40 146370 363.41 50 146371 377.96 63 146372 393.28 16 146494 172.70 20 146495 172.70 25 146496 247.17 32 146497 247.17 40 146498 312.59 50 146499 312.59 63 146500 312.59 16 146510 176.46 20 146511 176.46 25 146512 251.71 32 146513 251.71 40 146514 323.38 50 146515 323.38 63 146516 323.38 Pressure Gauge Version 3 /8 146390 179.45 1 /2 146391 190.08 3 /4 146392 265.31 1 146393 271.73 1 1 /4 146394 338.86 1 1 /2 146395 350.58 2 146396 362.66 16 146358 191.75 20 146359 193.82 25 146360 270.54 32 146361 277.08 40 146362 345.52 50 146363 357.48 63 146364 369.80 149
pressure relief valves ASV Stubbe Type 712 Pressure Relief Valve Description: Adjustable pressure relief valve Maximum Fluid Pressure at 20 C: Sizes 75mm & 90mm: 10 bar; 110mm: 6 bar Pressure Setting Range: Choice of 0.3 to 4 bar, 0.5 to 6 bar or 0.5 to 10 bar Opening Pressure: Approx. 0.3 to 0.5 bar Hysteresis: Maximum approx. 1 bar End Connections: Solvent cement spigots Features: Adjustable at any time, even during use. Vibration and flutter free during operation. Maintenance free. Setting Range 0.3 to 4 bar 75 1105 45 1179.17 75 1129 20 1296.40 90 1105 48 1866.80 90 1129 23 2053.96 110 1129 26 2856.59 110 1129 29 3140.66 Setting Range 0.5 to 6 bar 110 1118 56 2856.59 110 1129 32 3140.66 Setting Range 0.5 to 10 bar 75 1100 60 1179.17 75 1129 11 1296.40 90 1100 63 1866.80 90 1129 14 2053.96 Technical Resources Register online for our technical catalogue www.ipsflowsystems.com Or call our technical team on: 0800 975 79 71 150
pressure relief valves ASV Stubbe Type 718 Pressure Relief Valve Description: Adjustable pressure relief valve Pressure Setting Range: 0.5 to 10 bar Opening Pressure: Approx. 0.5 bar Hysteresis: Approx. 1 bar Ideal for Oscillating Pumps Setting Range - 0.5 to 10 bar End Connections: Solvent weld spigots Features: Adjustable at any time, even during use. Vibration and flutter free during operation. Maintenance free. High reproducability, low hysteresis. Options: A pressure gauge can be fitted on the primary or also on the secondary side. Size 12mm 12 1278 39 147.07 12 1278 40 151.56 MM Fusion Spigots 16 1352 69 147.14 20 1352 70 147.14 25 1352 71 210.54 32 1352 72 210.54 40 1352 73 278.37 50 1352 74 278.37 63 1352 75 278.37 Sizes 16-63mm Will it be in stock? Last year we shipped more than 27,500 consignments, and more than 95% were complete, first time! 151