DCV Wafer check valves

Transcription

1 V Wafer check valves

2 V wafer check valves to prevent reverse flow... The Spirax Sarco range of V wafer check valves provides an effective minimal maintenance free solution for the prevention of reverse flow in pipelines carrying most types of liquids, steam and gases. esigned to fit between two pipeline flanges, they provide a compact installation when compared size for size with conventional swing and lift type check valves. The Spirax Sarco range of V wafer check valves is available in a wide range of body materials from bronze to austenitic stainless steel and with seating options of stainless steel, viton or PM to match most applications. The V can be used in a wide variety of applications including: Hot and cold water system Sprinkler installations and condensate lines Process lines Heating systems Oil lines nd in industries as diverse as: hemicals Food production Pharmaceuticals Pulp and paper Ship building Textiles Power generation Flange standards: S tables and H; IN PN6, PN, PN6, PN and PN4; JIS, JIS, JIS6 and JIS; NSI and NSI. Seat options in stainless steel, viton for oils and gases and PM for water. Spring options: High temperature springs available. Heavy duty springs for boiler or gravity feedline applications. No spring option for very low opening differential pressures. (Vertical upward flow only). esigned and manufactured in accordance with S 748: of

3 N8 comparison Typical N8 conventional swing check valve Weight 7 kg User benefits an be used with a wide variety of liquids, gases and vapours. ompact design for simple installation between a wide range of flange types and in any plane. ach V is designed to fit between a variety of flange standards - simplifying and reducing spares stock holdings. 8 mm Wide variety of body materials, seating and springs allows product matching to the specific application. 7 mm typical N8 Spirax Sarco V Weight.6 kg omputer aided product design and up to the minute production methods ensures the product is of the highest quality. Materials of construction ensure low wear rates with minimal maintenance. Flow path design ensures low pressure drop. ompact design: Product options V PN6 bronze body for general purpose water and HV use. V PN4 ferritic stainless steel body for general purpose steam and fluids at high pressures. V PN4 austenitic stainless steel body for aggressive fluids, vapours, acids and alkalines. Full gasket area design: V4 V7 V8 V9 ustenitic stainless steel body with full gasket contact area, for NSI and flanges, for general purpose steam and fluids at high pressures, and for aggressive fluids, vapours, acids and alkalines. lower grade of austenitic stainless steel body for general purpose on steam and fluids at high pressures. ustenitic stainless steel body for aggressive fluids, vapours, acids and alkalines at high pressures and temperature. ustenitic stainless steel body for high flowrate applications, hot water systems, steam and condensate systems etc. Seating options and standards In stainless steel, viton for oils and gases, PM for water. Standard of shut-off conforms to: V///4 IN Part, N as standard and O as an option. V7 / 8 V9 IN part, O as standard. Soft seated versions meet IN part N and O provided a differential pressure exists. IN part, N as standard. Soft seated versions meet IN part N and O provided a differential pressure exists. isc seating and spring options Stainless With With Stainless Heavy High No steel disc Viton PM steel duty temperature spring insert insert spring spring spring V Standard Standard V Standard Standard V Standard Standard V4 Standard Standard V7 Standard Standard V8 Standard Standard V9 Standard Standard fluid passing through pipelines, in any industry.

4 Typical applications boiler flooding protection When boilers are shut-down and steam pressure lost, the head of water above the pump can cause flow through the pump flooding the boiler. The V fitted with a heavy duty spring and installed after the feedpump will prevent any gravity flow. Feedtank V oiler V Prevention of reverse flow Installed after multi-plex pump outlets in water distribution systems to prevent reverse flow during auto changeover sequencing and stand-by use. V V Vacuum breaker Installed in 'reverse' mode, the V will act as a vacuum breaker. This will prevent any back syphoning of liquids damaging upstream equipment when the steam supply is turned off and the equipment cools. Flowmeter V 4 V Pipeline fitting protection Prevents damage to pipeline fittings such as flowmeters, control valves and strainers which are susceptible to damage by reverse flow.

5 How V's work Spirax Sarco V wafer check valves are opened by the flow pressure of the fluid and closed by the spring when flow ceases and before reverse flow can occur. Open losed Installation The design of the Spirax Sarco V wafer check valve allows installation between flanges in any plane and with flow in any direction. The only exception is when the V is installed without a spring. The unit must then be installed in a vertical pipe with upward flow. The unique cam design of the V, and allows the various flange types to be accommodated by simply rotating the body to touch all flange bolts which automatically self centres the valve in the pipeline. The V4, 7, 8 and 9 use the body or cut outs in the body for location between the various NSI standard flanges. These valves are not recommended for applications where heavily pulsating flow exists, such as close to a reciprocating compressor. isc and spring combinations isc Spring Valve body markings High temperature spring N Standard metal disc Without spring W Heavy duty spring H Standard spring V Viton soft faced disc Without spring WV Heavy duty spring HV Without spring W PM soft faced disc Heavy duty spring H Standard spring Valves tested to IN part, T No identification indicates a standard spring with a metal disc. Water flowrate in Vw m³ /h Water flowrate in Vw m³ /h Pressure loss diagrams Pressure loss diagram with open valve at. The values indicated are applicable to spring loaded valves with horizontal flow. With vertical flow, insignificant deviations occur only within the range of partial opening. The curves given in the chart are valid for water at. To determine the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. Q Vw = Ö x V Vw = quivalent water volume flow in l/s or m³/ h Q = ensity of fluid kg/ m³ V = Volume of fluid l/s or m³/ h Pressure loss information for steam, compressed air and gases are available from Spirax Sarco Pressure loss in bar V4 (N-), V9 (N and 8 only).. V,,, 7 and 8 N N8 N6 N N4 N N N N N N8 N N4 N N N... Pressure loss in bar..... ifferential pressures with zero flow for: standard and high temperature springs Ô Flow direction Size N N N N4 N N8 N Where lowest opening pressures are required, valves without springs can be installed in vertical pipes with bottom-to-top flow. Without spring Opening pressures in mbar Water flowrate in Vw l/s Water flowrate in Vw l/s

6 V,, and V4 Sizes and pipe connections N,,,, 4,, 6, 8,. V, & can be fitted between S tables '' & 'H'; S 44 / IN PN6,, 6,, 4; JIS,, 6, with the following exception: N4,, 8 & - will not fit between JIS flanges. N6 & 8 - will not fit between S table '' Spring options Heavy duty spring for sizes up to N6. High temperature springs for temperatures up to 4 for all sizes of V models only Soft seated disc options Viton (for oils and gases) - temperature limits: - to + PM (for water) - temperature limits: - to + Materials V ronze IN W-Nr.. ody V Ferritic stainless steel IN W-Nr..4 V ustenitic stainless steel IN W-Nr..48 isc ustenitic stainless steel S S Spring retainer ustenitic stainless steel S S Standard spring ustenitic stainless steel S 6 6 S4 Heavy duty spring ustenitic stainless steel S 6 6 S4 High temperature spring Nickel alloy Nimonic 9 Limiting conditions V V V Maximum body design conditions PN6 PN4 PN4 PMO - Maximum operating pressure bar g TMO - With standard spring 6 Maximum With heavy duty spring - operating With high temperature spring temperature Without spring - 4 Minimum operating temperature Temperature limits with viton seat - to + Temperature limits with PM seat - to + old hydraulic test pressure bar g Temperature Temperature Operating range V 4 V and V 4 The product must not be used in the red region V without spring or with high temperature spring. - - V and V with standard and heavy duty spring. Sizes and pipe connections N,,, 4,, 8 and can be fitted between NSI or flanges Spring options High temperature spring for temperatures up to 4 Soft seated disc options Viton (for oils and gases) - temperature limits: - to + PM (for water) - temperature limits: - to + Materials ody ustenitic stainless steel STM FM isc ustenitic stainless steel S S Spring retainer ustenitic stainless steel S S Standard spring ustenitic stainless steel S 6 6 S4 Heavy duty spring usteitic stainless steel S 6 6 S4 High temperature spring Nickel alloy Nimonic 9 Limiting conditions V4 Maximum body design conditions NSI PMO - Maximum operating pressure bar g TMO - With standard spring Maximum With heavy duty spring - operating With high temperature spring 4 temperature Without spring 4 Minimum operating temperature -96 Temperature limits with viton seat - to + Temperature limits with PM seat - to + old hydraulic test pressure bar g 76 Temperature 4 Operating range 4 The product must not be used in the red region. - - High temperature spring and without spring. - - Standard spring and heavy duty spring. V4 6

7 V7 and V8 V9 Sizes and pipe connections N,,,, 4,, 6, 8,. V7 & 8 can be fitted between S 44 / IN PN, 6, and 4 flanges Spring options Heavy duty springs for sizes up to N6 for boiler feed applications. High temperature spring for all sizes of V8 models only, maximum 4. ody Soft seated disc options Viton (for oils and gases) - temperature limits: - to + PM (for water) - temperature limits: - to + Materials V7 ustenitic stainless steel (4) WS.48 V8 ustenitic stainless steel (6) WS.48 isc ustenitic stainless steel S S Spring retainer ustenitic stainless steel S S Standard spring ustenitic stainless steel S S4 Heavy duty spring ustenitic stainless steel S S4 High temperature spring Nickel alloy Nimonic 9 Limiting conditions V7 V8 Maximum body design conditions PN4 PMO - Maximum operating pressure bar g 4 TMO - With standard spring Maximum With heavy duty spring operating With high temperature spring - 4 temperature Without spring 4 Minimum operating temperature Temperature limits with viton seat - to + Temperature limits with PM seat - to + old hydraulic test pressure bar g 6 Temperature Temperature Operating range 4 4 V7 V8 4 The product must not be used in the red region. - - V8 without spring or with high temperature spring. - - V7 and V8 with standard and heavy duty spring. ody Sizes and pipe connections N and 8 can be fitted between NSI lass or flanges Spring options High temperature spring for temperatures up to 4 Soft seated options Viton (for oils and gases) - temperature limits: - to + PM (for water) - temperature limits: - to + Materials ustenitic stainless steel STM FM isc ustenitic stainless steel S S Spring retainer ustenitic stainless steel S S Standard spring ustenitic stainless steel S 6 6 S4 High temperature spring Nickel alloy Nimonic 9 Limiting conditions V9 Maximum body design conditions NSI PMO - Maximum operating pressure bar g TMO - With standard spring Maximum With heavy duty spring - operating With high temperature spring temperature Without spring 4 Minimum operating temperature -96 Temperature limits with viton seat - to + Temperature limits with PM seat - to + old hydraulic test pressure bar g 76 Temperature 4 Operating range 4 The product must not be used in the red region. - - High temperature spring and without spring. - - Standard spring. V9 7

8 imensions and weights (approximate) in mm and kg V, and Weight Size F V Kv V V N N N N N N N N N V4 Size F Weight Kv N N N N N N N Note: For V4 = entering dimension for NSI = entering dimension for NSI V9 Size F Weight Kv N N F F V7 and 8 Size F Weight Kv N N N N N N N N PN N PN Some of the products may not be available in certain markets. F Spirax-Sarco Limited, harlton House, heltenham, Gloucestershire, GL 8R UK. Tel: +44 ()4 6 Fax: +44 ()4 74 -mail: nquiries@spiraxsarco.com Internet: opyright Spirax Sarco is a registered trademark of Spirax-Sarco Limited V 8 S-S- ST Issue