SSV Special Compensating Bypass Check Valve

Transcription

1 V 18-0 pecial Compensating Bypass Check Valve ew - 0 ANI 0-0 Δp V R

2 V pecial Compensating Bypass Check Valve V 18-0 (type with integrated non-return valve in the bypass) Range of Applications Compared to the series V -1, the series V 18-0 uses an integrated non-return valve in the bypass. It automatically protects centrifugal pumps especially those handling hot water from damage which might occur through partial evaporation of the water content during low load operation. As soon as the pump capacity drops below a predetermined flow rate, the bypass valve opens sufficiently to maintain the pump minimum flow rate. This rate is maintained even if the flow through the main valve to the boiler or process is completely shut off. The pressure will be reduced by integrated throttle stages within the bypass. The type V 0 is supplied with a larger bypass. This is required for larger bypass flows differential pressure. The choice is done in our works. The valve range V is utilized for fluids with a viscosity < 0 ct without solids, e.g.: in boiler feed water and cooling water plants in Petrochemical and Chemical Industry and refrigeration in potable water supply and backwater disposal Offshore in snow production in steel production for fire fighting systems The utilization in nuclear power plants emphasizes the reliability of these fittings (certified to KTA 11).

3 V pecial Compensating Bypass Check Valve The Compensating Bypass Check Valves of the range V 18 can be utilized for Δp 0, the type V 19 for Δp and the V 0 for Δp with temperature ranges from - C + 0 C. The valves are manufactured in the sizes 5 to DN0 and the range of nominal pressure is 0 (ANI 0-ANI 0). The bypass flow can be up to % of the main flow, recoended is up to 5%. The valve operates without additional auxiliary energy. For the protection of fluid pumps with delivery heads of above 00 m we recoend the range MA /4 (see prospect) with ON/OFF -regulation of the bypass. All bypass valve components are easily serviced. To facilitate serving of the bypass valve, we recoend a removable flanged pipe approx. 1 m long to be fitted to the bypass branch. We also recoend to install a pressure relieve valve and a stop valve. The stop valve must be of a type which can be locked in the OPEN position. Illustration 1 shows a typical arrangement and flow scheme of our Compensating Bypass Check Valve. The hand-operated bypass feature is optional. In order to avoid vibrations in the valve and the pipes we recoend continuing the connecting line at the outlet () and Bypass branch (DN) for approx. - m in the chosen nominal size. A pipe bend directly at the bypass branch is not admissible. V ANI 0-0 Mode of Operation The Compensating Bypass Check Valve is flow controlled, that means the non-return cone () is kept in its operating position by main flow only. The valve is designed in such a way, that the cone reaches its utmost upper position at denominated main flow. The non-return cone activates the Rotary lide Valve (1) in the bypass by means of a lever (14). If the cone is positioned on the cone seat, the Rotary lide Valve is completely open. It closes corresponding to the rising of the cone by delivery in main direction. The valve just allows such an amount of bypass flow, as it is necessary for supplement of the required minimum flow of the pump. As soon as the main flow exceeds the minimum pump flow, the bypass closes. On the other hand the bypass opens again, when the main flow falls short of the bypass flow. Δp Installation Valves V should preferably be connected directly to the pump discharge branch, and must be mounted vertically with flow entry from below. imited possibilities for horizontal installation exist, but must be confirmed by the manufacturer. The bypass flow is piped back to the suction tank. Illustration 1: Bypass Return with additional hand operated branch (optional).

4 V pecial Compensating Bypass Check Valve Design The construction is according to specification AD 000 and particularly to EN As per Pressure Equipment Directive 9/ EG the products are provided with the CE marking and the Declaration of Conformity. Certified according to the Module 1 (Pressure Equipment Directive 9/ EG) all dangerous material classes of category 1 to 4 are covered. uitable nominal size and nominal pressure are to be chosen according to the pump pressure branch. owever, it must be observed, that the admissible flow velocity of m/s may not be exceeded (guarantee). Compensating Bypass Check Valves in larger sizes, for higher pressures and in special designs, which are not listed here, can also be supplied (on request). If the bypass flow has been indicated too low, it may result in vibrations within the plant, a haering Compensating Bypass Check Valve resp. a damage of the Valve and the pump (see inquiry specification ). Construction The Valve V comprises a radial split body with non-return cone (), and a separate bypass device in the bypass branch. All sliding parts are machined from proven stainless steels suitably matched to each other. Parts subjects to wear such as the check valve seat are stellitefaced. The coil springs are also made of stainless steel. In the standard version the casing is of forged steel PG (1.040). In addition highquality steels of various qualities can be supplied. In the Bypass the minimum flow is passed off automatically by the Bypass valve head (1). The pressure reduction from pump pressure to the counter pressure in the bypass line takes place via the Bypass Valve ead (1), the throttle (1) and the valve (1) for type V The hand operating branch with multiport-throttle is fitted at the casing below the cone seat and serves to pass off the minimum flow via a hand-operated valve combination. We recoend the branch for protection of the internal bypass parts at extreme operating conditions, e.g. at high differential pressures and frequent operation in the range of bypass flow as well as for filling and start-up of the plant. tart-up-trim (UT) substitutes the Bypass valve head during cleaning and start-up of plants and therefore spares the sophisticated regulating parts (optional, permanently open Bypass outlet). Also usable instead of the and operating branch. Warm-up branch, pressure gauge branch, draining branch etc. can be provided, if required. Flange designs to DIN, ANI, B, IO and all related standards are possible. Furthermore we supply: Compensating Bypass Check Valves with control disc and bearing plate in the bypass for high bypass flows at low pump pressure Autonomous Minimum Flow ystem Type MA /4 from DN upwards at pump pressures from -0. Multiport throttles for pressure- and flow reduction of high-pressure media from 5 upwards and pressures from to.

5 V pecial Compensating Bypass Check Valve V ANI 0-0 tandard body material (PG) V 18-0 with non-return valve in the bypass and hand-operated branch (optional) Parts ist V 18-0 ower body Part-No. 1 Upper body Part-No. Cone Part-No. Cone guide Part-No. 4 Cone guide Part-No. 5 Bypass branch Part-No. Valve head casing Part-No. 1 Rotary slide Valve Part-No. 1 Operating lever Part-No. 14 Throttle Part-No. 1 Non-Return Valve Part-No. 1 and-op. branch Part-No. 4 Multi-port throttle Part-No. 5 O-Ring Part-No. 8.1 O-Ring Part-No. 8. ocket screw Part-No ocket screw Part-No. 91. Coil spring Part-No (95.) Coil spring Part-No. 95. pare/wear Parts V 18-0 Bypass Valve ead, complete Part-No. 0, consisting of: Casing Part-No. 1 Rotary slide valve Part-No. 1 Operating lever Part-No. 14 Dowel pin Part-No Dowel pin Part-No. 94. Non-Return Valve in the Bypass Branch, complete, consisting of: Throttle Part-No. 1 Non-Return Valve Part-No. 1 O-Ring Part-No. 8. Coil spring Part-No. 95. ingle pare Parts O-Ring Part-No. 8.1 O-Ring Part-No. 8. Coil spring Part-No (95.) Coil spring Part-No. 95. Δp Materials according to operating conditions and valid standards.

6 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 18 - DIN [UG/min] -.0 DN

7 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 18 - DIN 15 [UG/min] DN V 18-0 Δp 00

8 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 18 - DIN [UG/min] DN V 18-0 Δp 00 1) of hand-operating branch Other pipe sizes, pressure ranges and special designs are deliverable on request. With reservation to changes of dimensions and weights.

9 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 18 - ANI lbs [UG/min] 0.0 DN V ANI Δp

10 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 18 - ANI. lbs [UG/min] DN

11 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 18 - ANI lbs [UG/min] DN V 18 ANI 0-0 Δp 00 1) of hand-operating branch Other pipe sizes, pressure ranges and special designs are deliverable on request. With reservation to changes of dimensions and weights.

12 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 0 - DIN [UG/min] DN V 0-0 ANI 0-0 Δp

13 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 0 - DIN [UG/min] DN V 0-0 ANI 0-0 Δp

14 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 0 - DIN 00 [UG/min] DN V 0-0 ANI 0-0 Δp

15 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 0 - ANI. lbs [UG/min] DN V 0 ANI Δp

16 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 0 - ANI lbs [UG/min] DN

17 V pecial Compensating Bypass Check Valve Dimensions and s of Valve Range V 0 - ANI lbs [UG/min] DN V 0 ANI Δp 1) of hand-operating branch Other pipe sizes, pressure ranges and special designs are deliverable on request. With reservation to changes of dimensions and weights. V R Johannesburg Tel : Fax : sales.jhb@valve.co.za Durban Tel : Fax : sales@valve.co.za