Modulating control valve PN16

Transcription

1 8 Modulating control valve PN with magnetic actuator for HTHW and steam, with positioning control and position feedback MH...FY...N Control valve with magnetic actuator for modulating control in district heating systems and HTHW and steam applications Fast positioning time (< s) High resolution (> : 000) High rangeability Closed when de-energised With positioning control and position feedback Low friction, robust and maintenance-free se The MH...FY...N valve types are through-port control valves with a fixed magnetic actuator. The actuator is equipped with connecting electronics for positioning control and position feedback. At zero current the valves are closed. The short positioning time, high resolution and high rangeability make these valves ideal for proportional control of district heating stations and heating plant using HTHW and steam. The low-friction, robust and maintenance-free construction makes regular service unnecessary. Type summary Operating data q [mm ] DN kvs PN Pmed...0 alve type [mm] [m /h] [A] [A] L [m] MHFY0N MHFYN MHFYN MH0FYN MHFYN MHFYN MH0FYN MH0FYN Legend see page Siemens Building Technologies CAN8E /.998 Landis & Staefa Division /

2 Legend : PN = Nominal power Pmed = Mean operating power kvs = Flow rate to DI/DE7, tolerance ±0 % q = Cross section of AC or DC 0 cable (Cu) L = Max. cable length. With -wire connections, the maximum length of a separate. mm Cu control signal cable may be extended to 00 m. Ordering The valves are supplied complete with the magnetic actuator and the terminal housing. The Z00/... damping device can be ordered on request: see 'Accessories'. When placing an order, please specify the quantity, product description and type code. Example: control valve MHFYN and damping device Z00/ Technical / Mechanical design The control signal is converted in the terminal housing into a phase cut signal which generates a magnetic field in the coil. This causes the only moving part, the armature, to change its position in accordance with the interacting forces (magnetic field, counterspring, hydraulics etc.). The armature responds rapidly to any change in signal, transferring the corresponding movement directly to the control disc, enabling fast changes in load to be corrected quickly and accurately. The valve position is measured continuously. Any disturbance in the system is rapidly corrected by the internal positioning controller, which ensures that the control signal and the valve stroke are exactly proportional, and also provides a feedback signal indicating the valve position. Stroke [%] Control signal [] If the power is switched off or fails, the valve is automatically closed by the force of the spring. The valve stem is sealed with a maintenance-free O-ring gland. See sheet 08 for a detailed description of operation. Manual adjustment Accessories The control path can be opened mechanically to between 0 and approximately 90 %, by turning the handwheel clockwise. The manual adjustment facility can also be used as a mechanical method of low limit control, i.e. the valve will exercise its normal control function between the manually-set position and the 00 % open position. For full-stroke automatic control, the handwheel must be set to 0 (the anticlockwise end-stop). Z00/... Damping device to extend the closing time from <s to s. See sheet 97. See sheet 000 for an overview of water and steam valves. CAN8E /.998 Siemens Building Technologies / Landis & Staefa Division

3 Sizing Water flow chart Flow / pressure differential relationship. kvs signifies the volume of water in m /h, which flows through the open valve at a pressure differential pv of 00 kpa ( bar). See sheet 0 for notes on calculating the value of kvs. [m /h]. 9IE [l / s] ,7 0, 0, 0, 0, MH..FY..N S DN0 k 0 S DN0 k 0 S DN k S DN k 8 S DN0 k S DN k S DN k, DN S k 0, ,7 0, 0, 0, 0, 0, 0,07 0, [kpa] 0, 0, 0, 0, 0,7 7 0 [b ar] p v Saturated steam flow chart 9I7E p v p 00 [ ] MH..FY..N b a 0,, , 0,0 0,0 0, 0,0 0, [kpa] 7 0 [bar] p [kg/h]. m Mounting notes Two sets of mounting instructions are enclosed with the valve: Ref. 0 (valve) and Ref. 77 (terminal housing). Warning : Always disconnect the power before fitting or removing the terminal housing. The terminal housing is calibrated and matched to the actuator, and should be replaced only by qualified personnel. A fine mesh strainer installed on the inlet side of the valve is essential to prevent the ingress of grit. ertical to horizontal mounting: Protection standard IP. The valve must not be suspended below the horizontal. The actuator must not be lagged. For special information on use in steam applications, see sheet 0. Siemens Building Technologies CAN8E /.998 Landis & Staefa Division /

4 Recommendation Water systems should be cleaned, flushed and treated in accordance with current good practice, as described, for example, in BSRIA Application Guides AG 8/9 and AG/9. For other relevant information, see also CIBSE Guide B (Section 7). Technical data Electrical interface: Only admissisble with low voltage (SEL, PEL) Supply voltage AC, 0/0 Hz Max. voltage tolerance +/ 0 % Nominal power See table 'Operating data' page Control signal DC or DC... 0 ma Position feedback (output signal) DC = % stroke Max. load. ma Accuracy ± % of full scale Nominal pressure PN Operating pressure p e max: Water up to 0 C. MPa ( bar) Above 0 C. MPa ( bar) Saturated steam 0.9 MPa ( 9 bar) Pressure differential p v max.0 MPa (0 bar) Leakage at p v = 0. MPa ( bar) Max. 0.0 % k vs (to DE/DI7) Temperature of medium...80 C alve characteristic (stroke, k v ) Linear, optimised in low opening range Resolution H / H00 > : 000 (H = Stroke) Type of operation Modulating Manual adjustment p to max. 90 %, depending on DN Position when de-energised Closed Orientation pright to horizontal Positioning time *) < s Materials: Housing Spheroidal graphite cast iron (GGG0.) Seat / inner valve CrNi steel alve stem seal EPDM (O ring) Connection terminals Screw terminals for mm wire Protection standard pright to horizontal mounting IP to IEC9 Ambient temperature... 0 C Weight (incl. packaging) See table 'Dimensions' on page Conformity Meets the requirements for CE marking *) The valve can be fitted with a Z00/... damping device to achieve a slower closing time of s. Internal diagram NS = system ground LS ~ G + AC NS T M 0 Block diagram of signal converter Input DC Output DC... 0 ma R T + E Q Position transducer Output DC Position-feedback electronics with base/span adjustment Key to block diagram E Phase cut converter G Bridge rectifier M Magnetic valve Q Phase cut output R T Input resistor 0 k ohms oltage / current converter (load on 0 ohms to NS) Position / voltage converter Differential amplifier CAN8E /.998 Siemens Building Technologies / Landis & Staefa Division

5 Connection terminals Warning : If the controller and the valve receive their supply from a separate source, the valve transformer must not be earthed on the secondary side. 0B ~ TE AC supply Input DC Output DC Input DC... 0 ma Connection diagrams with DESIGO 0 with INTEGRAL RS refer to manual R refer to manual K with MLTIREG Warning : The T transformer must not be earthed on the secondary side and should be suitably fused. T T AC AC RPR MH...FY...N 0en AC GND Output DC Input DC ) alve position indication DC = % ) ~ AC Supply Input DC 0..0 Output DC 0..0 T E with other controllers (output DC ) T AC MH...FY...N 0en Output DC alve position indication DC = % ) ~ T E AC Supply Input DC Output DC with other controllers (output DC... 0 ma) T AC MH...FY...N 099en Output DC... 0 ma alve position indication DC = % ) ~ AC Supply Output DC Input DC... 0 ma T E ) only if needed Siemens Building Technologies CAN8E /.998 Landis & Staefa Division /

6 Application examples Examples of installation in straight-through applications (principles only, without installation-specific details) 9H808 A 9H807 A D E D : District heating (supply heating) system, indirect connection E : District heating (supply heating) system, directly connected to water-heating system. Dimensions All dimensions in mm 90 min. 00 ø 0 F ø E H Cable connection max. x ø,8 b ø d ø k ø D Flange dimensions to DIN, PN DN L alve type L ø D ø d b ø k H ø E F W MHFY...N 0 9 x MH0FYN 0 0 x MHFYN 0 x MHFYN 80 0 x MH0FYN 00 0 x MH0FYN 0 x W = Weight (incl. packaging) in kg 998 Siemens Building Technologies Ltd. CAN8E /.998 Siemens Building Technologies / Landis & Staefa Division