Technote. Frese PVS - Dynamic Pressure and Flow Regulation Valve. Application. Features. Benefits.

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1 Page 1 of 15 - Dynamic Pressure and Regulation Valve Application system can be installed in domestic and commercial heating and cooling systems. system is a dynamic valve arrangement designed to regulate flow and differential pressure using the Frese S dynamic balancing valve positioned in the flow, and the Frese PV differential pressure control valve positioned in the return. The PVS is supplied with capillary tube, isolation valves, drain valves, P/T plugs and unions as standard. system ensures 1% flow and differential pressure regulation under all conditions, irrespective of any changes within the system, providing simple and trouble free commissioning. The system operates by limiting the flow in the system and eliminating any noise caused by excess differential pressure. Benefits Features and differential pressure can be adjusted independently of each other. Setting the differential pressure can be easily adjusted after installation. Size range: DN15 to DN5 Maximum flow: 1.3m 3 /h Maximum differential pressure 25kPa/4kPa Tamperproof presetting device fitted on the top of the valve. Simple presetting of flow and pressure. Setting range: 5kPa to kpa Differential pressure regulation, flow regulation, isolation, drain and PT plugs as standard No additional commissioning required if the system design is changed. High levels of comfort and energy savings for the end user. UK DEC. 9

2 Page 2 of 15 - Dynamic Pressure and Regulation Valve Design Simplified outline Frese S Adjustable Dynamic Balancing Valve System Frese PV Adjustable Differential Pressure Control Valve Return system measurement of differential pressure and flow across the valve Frese S Design flow: Q is adjusted directly on Frese S (see graphs on the diagram) Differential pressure : ΔP S is adjusted directly on Frese PV (see graphs on the diagram) Return Frese PV P F- The flow in the system is verified by measuring minimum differential pressure (min. Δp) is avaliable across the Frese S valve. Measured from P F+ to P F- (see graphs on the Preset diagram) P F+ Δp of the system is measured from P F- to P +. P + UK DEC. 9 P -

3 Page 3 of 15 - Dynamic Pressure and Regulation Valve Technical data Housing: DP controller: setting: Spring: Diaghragm: O-rings: Pressure class: Max. differential pressure: Temperature range: Capillary tube: DZR, Brass CW62N PPS 4% glass PPO Stainless steel HNBR EPDM PN16 LP = 25 kpa HP = 4 kpa -1 C to + 12 C Ø3, L = 1mm L1 H2 Return H1 H3 H L Type Application Two-pipe system UK DEC. 9 Dimension DN15 DN2 DN25 DN32 DN4 DN5 Version LP HP LP HP LP HP HP HP HP Control range [kpa] Pressure range [kpa] PV,14-,167,2-,333,2-,27,42-,556,167-,694,194-1,167,27-1,39,33-2,222 1,39-4,167 rate [l/s] S,7-,223,11-,36,11-,351,1-,512,17-,462,25-,653,6-1,32,49-2,67,122-2,6 PVS,14-,167,2-,36,2-,27,42-,512,167-,462,194-,653,27-1,32,33-2,67 1,39-2,6 Dimension mm L H H L H H

4 Page 4 of 15 - Dynamic Pressure and Regulation Valve Product programme PVS with 2 isolation valves, 2 drain valves, P/T plugs, capillary tube and union connections. Dimension DN15 DN2 DN25 DN32 DN4 DN5 - LP Frese PV, 5-3 kpa & Frese S, LP - HP Frese PV, 2-6 kpa & Frese S, HP - LP Frese PV, 5-3 kpa & Frese S, LP - HP Frese PV, 2-6 kpa & Frese S, HP - LP Frese PV, 5-3 kpa & Frese S, LP - HP Frese PV, 2-6 kpa & Frese S,HP HP Frese PV, 2- kpa & Frese S, HP HP Frese PV, 2- kpa & Frese S, HP HP Frese PV, 2- kpa & Frese S, HP Accessories Frese no. Dim./DN Insulation jackets PV+S PV+S /2/ /4/5 Spindle extension Example 15/ /4 5 Please note: As the flow is reduced in the circuit in question the pressure increases in reverse ratio to the flow, which is due to the P-band of the adjustment spring. The valve still compensates for this. Frese S Frese PV However, the pressure will nowhere in the circuit be as high as the pump pressure that would have been available if Frese PV had not been installed. In this example the pressure increases to approx. 14 kpa as the graph is offset parallel to the course of flow. Furthermore, you can always read from the graph what the pressure in the circuit will be like at any flow rate below the rated 5 l/h. L/s L/h,167 6,139 5,111 4,3 3 5 kpa 1 kpa rate graph - Frese PV DN15 15 kpa ΔPs 2 kpa Pp = Pump pressure Ps = Differential pressure Pv = Pressure loss across valve 25 kpa Frese PV kpa 3 kpa 2, 1,9 1,2,7,56 2,3 UK DEC. 9,2 1,1, Setting [ Numbers of turns]

5 Page 5 of 15 - Dynamic Pressure and Regulation Valve Example DN15 Low Pressure Design differential pressure 12 kpa Design flow,139 l/s Differential pressure setting Frese PV 1. The design flow is used as the point of reference for the setting. (See the graph) 2. In order to make reading easier the graphs indicating the pressure in the circuit are arranged at intervals of 5 kpa. Still, the graphs can be offset according to the specified pressure of 12 kpa in our circuit. From the intersection of the 12 kpa graph and the horizontal line indicating,139 l/s a line perpendicular to the x-axis is made to read the pre-set value. app. 7 turns on the scale. 3. The minimum pressure drop required will be 1.9 kpa across the valve. (ΔP V2 ) L/s L/h,167 6,139,111,3,56, kpa 1 kpa Frese PV DN kpa 12 kpa 2 15 kpa 2,, kpa 25 kpa 3 kpa 1,9 1,2,7,3,1 3 setting Frese S 1. The design flow is used as the point of reference for the setting. (See the graph) 2. The pre-setting for the valve is found by means of the flow rate graph. Setting = The minimum pressure drop required will be 11 kpa across the valve. (ΔP V1 ) Frese S DN15 Low Pressure (l/s) (l/h) kv (m 3 /h) min. Δp kpa,1,222,3,6, 1,1 1,3 1,6 1, 2,1 2,2 12,,194, ,2 11,6, , ,4,3 3 9,,56 2 9,2 Total pump pressure Calculation of the total pump pressure: Pp = Ps + ( P V1+V2 ) Pp = 12 kpa + (11 kpa + 1,9 kpa) = 24,9 kpa, ,6 UK DEC. 9

6 Page 6 of 15 DN15 LP - Dynamic Pressure and Regulation Valve L/s L/h,167 6 Frese PV DN kpa ΔPs 2,, ,9, kpa 1 kpa 15 kpa 2 kpa 25 kpa 3 kpa 1,2,3 3,7,56 2,3,2 1,1, (l/s) (l/h),222 Frese S DN15 Low Pressure Kvs (m 3 /h) min. Δp kpa,1,3,6, 1,1 1,3 1,6 1, 2,1 2,2 12,, ,2, ,6, , ,4,3 3 9,,56 2 9,2,2 1,6 UK DEC

7 Page 7 of 15 DN15 HP - Dynamic Pressure and Regulation Valve Frese PV DN kpa L/s,333 L/h 12 11,1,27 1 7,7,222 2 kpa 3 kpa 4 kpa 5 kpa 6 kpa 4,9, ,, ,2,56 2,3, Frese S DN15 High Pressure kv (m 3 /h),1,3,6, 1,1 1,3 1,6 1,9 2,2 2,4 Δp kpa UK DEC. 9

8 Page of 15 DN2 LP - Dynamic Pressure and Regulation Valve L/s L/h,27 1 Frese PV DN2 5-3 kpa ΔPs 6,3,25 9 5,1,222 4,,194, kpa 1 kpa 15 kpa 2 kpa 25 kpa 3 kpa 3,1 2,3, ,6, ,,3 3,6,56 2,3,2 1, , 1 (l/s) (l/h), Frese S DN2 Low Pressure Kvs (m 3 /h) min. Δp kpa,2,5,9 1,4 1, 2,2 2,5 2,9 3,2 3,3 15,333,36,27,25,222,194,167,139,111,3,56, , , , ,5 11 1,5 1 9,5 9 UK DEC. 9,

9 Page 9 of 15 DN2 HP - Dynamic Pressure and Regulation Valve Frese PV DN2 2-6 kpa L/s,556 L/h 2 25,,5 1 2,3, ,,39, kpa 3 kpa 4 kpa 5 kpa 6 kpa 12,3 9,,27 1 6,3,222 4,, ,3, ,,56 2, , 17 1 Frese S DN2 High Pressure kv (m 3 /h),2,6 1, 1,5 1,9 2,3 2,7 3,1 3,5 3,6 Δp kpa UK DEC. 9

10 Page 1 of 15 DN25 LP - Dynamic Pressure and Regulation Valve L/s L/h, Frese PV DN kpa ΔPs 6,9, ,4, kpa 1 kpa 15 kpa 2 kpa 25 kpa 3 kpa 2,5,27 1 1,1,139 5, , (l/s) (l/h),472 17,444 16,417 15,39 14, Frese S DN25 Low Pressure Kvs (m 3 /h) min. Δp kpa,2,7 1,3 1,9 2,5 3, 3,4 3,7 4, 4, , ,5 15,333,36,27,25,222,194,167,139,111, , , , ,5 11 1,5 1 UK DEC. 9,56,2 2 9,5 1 9,

11 Page 11 of 15 DN25 HP - Dynamic Pressure and Regulation Valve Frese PV DN kpa L/s 1,111 L/h 4 17,7, ,6, kpa 3 kpa 4 kpa 5 kpa 6 kpa 1,, ,9, ,4, ,5,27 1 1,1,139 5, , Frese S DN25 High Pressure kv (m 3 /h) Δp kpa,3, 1,5 2,2 2, 3,3 3, 4,1 4,3 4,4 UK DEC. 9

12 Page 12 of 15 DN32 HP - Dynamic Pressure and Regulation Valve L/s L/h 1,39 5 Frese PV DN32 2- kpa ΔPs 19,2 1, ,6 1, ,3,972, kpa 3 kpa 4 kpa 5 kpa 6 kpa 7 kpa kpa 9,4 6,9, ,, ,1, ,7,27 1,,139 5, , Frese S DN32 High Pressure (I/S) (I/H) Kvs (m 3 /h) Δp kpa,6 1, 3, 4,1 5,2 6,3 7,3,1,7, UK DEC. 9

13 Page 13 of 15 L/s L/h 2,222 DN4 HP - Dynamic Pressure and Regulation Valve Frese PV DN4 2- kpa ΔPs 23, 1, ,2 1,667 1, kpa 3 kpa 4 kpa 5 kpa 6 kpa 7 kpa kpa 13,4 9,3 1, ,9,33 3 3,3, ,5,27 1, , (I/S) (I/H) Frese S DN4 High Pressure Kvs (m 3 /h) Δp kpa,5 2, 4, 5,9 7,6 9, 1,5 11, 12,9 13,2 UK DEC. 9

14 Page 14 of 15 DN5 HP - Dynamic Pressure and Regulation Valve L/s L/h Frese PV DN5 2- kpa ΔPs 3, ,2 3, ,9 2, kpa 3 kpa 4 kpa 5 kpa 6 kpa 7 kpa kpa 31,2 2,222 2, 1, ,2 1, ,, , , (I/S) (I/H) Frese S DN5 High Pressure Kvs (m 3 /h) Δp kpa 1,1 3,6 6,2,6 1,6 12,4 14, 15,4 16,2 16,7 UK DEC. 9

15 Page 15 of 15 - Dynamic Pressure and Regulation Valve Text for technical specifications The valve should be a dynamic differential pressure and flow control valve with the option of setting the differential pressure and flow on site without suspension of operation. The valve should limit the differential pressure in a circuit. The valve should include optional P/T plugs for the verification of differential pressure in circuit and across the valve. The differential pressure control valve scale should only be adjustable by means of a key. The flow control valve should only be adjustable by means of a lockable handle. The valve should be permanently marked with an indicator for flow direction. Pressure rating PN16. UK DEC. 9 Frese A/S assumes no responsibility for errors, if any, in catalogues, brochures, and other printed matter. Frese A/S reserves the right to modify its products without prior notice, including already ordered products, if this does not alter existing specifications. All registered trademarks in this material are the property of Frese A/S. All rights reserved. Frese A/S Sorøvej DK- 42 Slagelse Tel: Fax: frese@frese.dk