VGG... VGF... VGH... Gas Valves. Building Technologies HVAC Products VGG... VGF... VGH...

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1 7 66 VGG... VGF... VGH... Gas Valves VGG... VGF... VGH... Single valves of class A for installation in gas trains Safety shutoff valves conforming to EN161 in connection with actuators Suitable for use with gases of gas families I...III Gas valves in connection with actuators open slowly and close rapidly 2-port valves of the normally closed type ½... DN125 The gas valves are used in combination with the SKP / SKL actuators As a control valve in connection with SQX... actuators and AGA60 adapter (not as a safety shutoff valve) Supplementary Data Sheets on actuators (refer to «Mechanical design») The VG... and this Data Sheet are intended for use by OEMs which integrate the gas valves in their products! HVAC Products

2 Use The gas valves are used primarily - for application at gas-fired combustion plant - for gas trains at forced draft burners The gas valve is used as: - Shutoff valve (in combination with SKP1...) - Control valve with shutoff feature (in combination with SKP2..., SKP5 or SKP7 ) - As shutoff or control valves in the supply air line of industrial combustion plant with or without heat recovery system If the gas valves are used with gases other than those of gas families I...III, Siemens assumes no responsibility for the valve s durability and life expectancy. All types of gas valves can be combined with any of these actuators. Warning notes To avoid inquiry to persons, damage to property or the environment, the following warning notes must be observed! Do not open, interfere with or modify the gas valves except when installing the service replacement kit Any opening of the gas valve, replacement of parts or modifications to the original product is the user s responsibility and carried out at his own risk All activities (mounting, installation and service work, etc.) must be performed by qualified staff When used in connection with gas, the gas valves constitute part of the safety equipment In combination with SQX... or SKL... actuators, the gas valves must not be used as safety devices Fall or shock can adversely affect the safety functions. Such gas valves must not be put into operation, even if they do not exhibit any damage Not suitable gases or gas components causes loss of the safety shutoff function It may not join contaminant / particles in the valve, because that could adversely affect the safety shutoff function Engineering notes Profile (only for VGG... / VGF...) Owing to the profile of valve disc, the gas valves are especially suited for control functions. Benefit: Good control performance and hardly prone to hunting in low-fire operation z10/0502 Legend 1 Stem 2 Profile Valve disc 2/18

3 Mounting notes Ensure that the relevant national safety regulations are complied with The actuator can be mounted or replaced while the gas valve is under pressure Refer also to the following Mounting Instructions AGA66 M VGF M766 / M VGFDN M766.1/M VGG M766 / M VGG1/2"..." M766.1/M VGH M766 / M VGx M VGx M Sealing / tightness Mounting position Direction of flow Function Only VGG...: Only VGD20 Only VGF.../VGH... Check to ensure that the gas valve is tight when all components are connected Check to ensure that the gaskets between the flanges and the gas valve must be fitted The permissible mounting positions of the actuator must be observed, however (refer to the relevant Data Sheet). The direction of gas flow must be in accordance with the direction of the arrow on the valve body. The inactive gas valve is closed and opens when the actuator opens. Check to ensure that cuttings not falling into the gas valve when mounting the connecting pipes. As the case arises, the gas valve can be opened and cleaned from below (spring dome) To prevent cuttings from falling into the gas valve, first mount the flanges on the pipes and then clean the parts Check to make certain that the bolts of the flanges are properly tightened and afterwards check to ensure that the gas valve is tight when all components are connected /18

4 Standards and certificates Conformity to EEC directives - Electromagnetic compatibility EMC (immunity) - Directive for gas appliances - Directive for pressure devices 2004/108/EC 90/96/EEC 97/2/EC ISO 9001: 2000 Cert ISO 14001: 2004 Cert. 82 For use in the U.S. / Canada, the gas valves carry type suffix «U» (see example) and, and listed. Example: VGG10.204U Approvals in combination with actuator Type reference VGG10.154P x x VGG10.204P x x x VGG10.254P x x x VGG10.404P x x x VGG10.504P x x x VGG10.804P x x x VGG P x x VGG P x x VGG P x x VGG P x x VGG P x x VGG x x VGG x x VGG x x VGG x x VGF10.404P x x VGF10.504P x x VGF10.654P x x x VGF10.804P x x x VGF P x x VGF P x x VGF P x x VGF x x VGF x x VGF x x VGF x x VGH x x x VGH x x x VGH x x x 4/18

5 Service notes Each time a gas valve has been replaced, check to ensure that the gas valve operates correctly and that it is tight both internally and externally Siemens gas valves may only be repaired by Siemens HVAC Repair Centers VGH... gas valves are supplied without strainer. Fit a gas filter upstream of the gas valve or an AGA... strainer (refer to «Accessories») by the gas inlet Life cycle The combination gas valve VG... and actuator have a designed lifetime* of 100,000 burner startup cycles which, under use of gases to EN47 (or DVGW specification G260). This lifetime is based on the endurance tests specified in standard EN161 and the table containing the relevant test documentation as published by the European Association of Component Manufacturers (Afecor) ( The designed lifetime is based on use of the gas valve VG... and actuator according to the manufacturer s Data Sheet. After reaching the designed lifetime in terms of the number of burner startup cycles, or the respective time of usage, the gas valve VG... and actuator are to be replaced by authorized personnel. * The designed lifetime is not the warranty time specified in the Terms of Delivery Disposal notes Local and currently valid legislation must be observed. 5/18

6 Mechanical design VGG... / VGF... Stem Strainer Valve seat The gas valves are dead closed in combination with actuator. The stem is guided on both sides of the valve disc, ensuring precise axial stroke and tight shutoff. A strainer made of stainless steel is fitted in the gas valve s inlet and protects the gas valve, the seat and disc as well as downstream devices against dirt. For use with profile, the gas valves carry type suffix «P» (see example) Example: VGG10.154P VGH... Strainer Valve seat Actuators A strainer type AGA... is available as an accessory item (refer to «Accessories»). The gas valves are supplied without strainer (refer to «Engineering notes»). They are of the normally closed one-way high-flow type. The swiveling disc of gas valve has no profile. The gas valves can be combined with the following types of actuators: Type reference Data Sheet Function SKP15... N764 ON / OFF SKP25... N764 ON / OFF with constant pressure control SKP with SQS7... N764 ON / OFF with pressure control and via electric signal alterable setpoint setting SKP55... N764 ON / OFF with differential pressure control, signal input differential pressure SKP75... N764 ON / OFF with ratio control, signal input static pressure SKL25... (only for air) N764 ON / OFF with constant pressure control, slow closing s, no function of safety shutoff SQX... with AGA60 N4554 Steady position control, no function of safety shutoff 6/18

7 Type summary (other types of gas valves on request) Perm. operating pressure in Number of connections Type reference mbar Air flow rate at With profile Without profile Europe Other Δp = 1 mbar Test point Pilot gas Without stroke With stroke Without stroke With stroke Nominal size Material (to EN) countries / m³ / h RP ¼ ) G ¾ 4) limitation limitation 1) limitation limitation 1) Internally threaded to ISO 7/1 ½ Die-cast al VGG10.154P VGG P ¾ Die-cast al (1400)* VGG10.204P VGG P VGG Die-cast al (1400)* 1. 4 VGG10.254P VGG P VGG ½ Die-cast al (1400)* 2. 4 VGG10.404P VGG P VGG Die-cast al (1400)* VGG10.504P VGG P VGG Cast iron (700)* VGG10.804P * Only for use in Australia With flange, PN16, to ISO 7005 DN40 Cast iron VGF10.404P VGF DN50 Cast iron VGF10.504P VGF P VGF DN65 Cast iron (700)* VGF10.654P VGF P VGF DN80 Cast iron (700)* VGF10.804P VGF P VGF * Only for use in Australia Flap type gas valves: High-flow with swing type disc. Great closing force. Version without strainer, to DIN, only for use on plant with gas strainer. We recommend to install a strainer (refer to «Accessories» AGA80, AGA90 or AGA91! These gas valves may only be revised by Siemens Repair Centers DN80 Cast iron (700)* VGH DN100 Cast iron (700)* VGH DN125 5) Cast iron (500)* VGH * Only for use in Australia with SKPxx.xxxFxx (must be checked by application side) Legend (also refer to «Dimensions») 1) Cannot be used with attached pressure governor 4) Inlet side, VGF... with one connection on each side 2) Flow rate reduced by 20 % 5) Only for SKPx5.xxxFxx ) On inlet and outlet side Ordering When ordering, please give the complete gas valve type reference. Actuator and gas valve are supplied as single packs. Example: 1 piece VGF10.654P flanged valve DN65 1 piece actuator 7/18

8 Accessories Manual adjuster AGA61 Adapter for SQX... actuators Consisting of 2 stem parts and a connecting flange AGA60 Gasket kit to SKP... / SKL Between actuator SKP / SKL25 and gas valve VG - For increasing of degree of protection from IP54 up to IP65 - Refer to Mounting Instruction M764.2 ( ) AGA66 Only VGG10.154, VGG10.204, VGG10.254, VGG : When used in connection with AGA66, the maximum flow rates are reduced by about 25 %. VGH... Strainer With circlip and 1 mm mesh size. Type reference of gas valve VGH / DN80 VGH / DN100 VGH / DN125 Type reference of strainer AGA80 AGA90 AGA91 The strainers can be fitted in the flange sections of the gas valves, either on the gas inlet or gas outlet side. 8/18

9 Technical data General unit data Valve class in connection with actuator A conforming to EN161 (except with SQX... / SKL...) Group 2 (EN161) Perm. medium temperature C Weight Refer to «Dimensions» Connecting flanges (VGF..., VGH...) PN16 to ISO Required flow rate Refer to «Flow chart» Perm. mounting position 7648z09/060 Operating pressure Types of gases Strainer (only for VGG... / VGF...) (refer to «Mounting notes») Refer to «Type summary» Refer to «Use» Built-in, mesh size 0.9 mm Environmental conditions Storage DIN EN Climatic conditions Class 1K Mechanical conditions Class 1M2 Temperature range C Humidity <95 % r.h. Transport DIN EN Climatic conditions Class 2K Mechanical conditions Class 2M2 Temperature range C Humidity <95 % r.h. Operation DIN EN Climatic conditions Class K Mechanical conditions Class M Temperature range C Humidity <95 % r.h. 9/18

10 Function Sectional view of VGG... pe 766z19/0805 Application example VGG... complete with SKP25... Sectional view VGG... complete with SKP z20/0805 pe 10/18

11 Function (cont d) Sectional view of VGF z2/0408 pe Application example VGF... complete with SKP25... Sectional view VGF... complete with SKP z22/0408 pe 11/18

12 Function (cont d) Sectional view of VGH... Strainer Fully closed 766z06e/0100 Strainer Fully open Application example VGH... complete with SKP25... Sectional view VGH... complete with SKP25... pe 766z21/ /18

13 Flow chart for VG... (For fully open gas valves only) p mbar 766d01e/0608 VGG VGF m / h 1 Natural gas m / h 2 Propane m / h Town gas m / h 4 Air 1/2" ) /4" ) 1" ) VGH 1) DN40; 1 1/2" Flow chart DN50; 2" DN65 DN80; " DN80 1) Corresponding to fully open valve or governor 2) Without strainers ) Flow rate of valves with throttle 20 % lower DN100 DN125 For control performance reasons, when using the SKP2... actuators with integrated governor, the nominal valve size should not be too large. This applies in paricular to burners burning small amounts of gas in the low-fire position and to burners changing from high-fire to low-fire in less than 5 s. Conversion factors 1 Natural gas Liquefied petroleum gas 0.77 Town gas Air f = 1 Calculation fo factor "f" For other types of gases 1 f = dv (gas) dv = density ratio to air Iff possible select flow rate within bold lines! Flow rate m / air x Wobbe number (MJ/m ) = burner output (MJ/h) Calculation example Available pressure drop across the valve 2 mbar Required flow rate 60 m /h natural gas Selection according to chart DN1 1/2" (point of intersection of 2 mbar and 60 m /h natural gas) Legend Maximum flow rate (gas valve fully open) 1) The valve curves shown represent gas valves with no strainer. Each strainer reduces the flow rate by about 8 % The bold curves represent the recommended pressure drop ranges. Gas valves with higher pressure drops can cause excessive flow noise. Practical experience shows that applications outside the range confined by the bold characteristics could produce significant noise 1/18

14 Flow chart (cont d) Note: In the case of burners with low-fire flow rates, select a tightly sized gas valve (refer to the Data Sheet of the relevant actuator) If the available gas pressure exceeds the maximum permissible operating pressure, use an upstream pressure controller to lower it The pressure drop (curves of maximum flow) is based on a fully open gas valve Conversion of air flow rate to a corresponding gas flow rate (natural gas): Basis for scale Abscissa Volumetric flow «QG» in m³/h Density ratio «dv» to air Conversion factor 1 f = dv 1 Air Natural gas Propane Town gas Conversion to air (m³ / h) from other types of gases: QL= QG f QL = air volume in m³ / h that produces the same pressure drop as «QG» When used in connection with actuators having an integrated governor, the nominal valve size should not be selected too large to ensure good control performance. 14/18

15 Dimensions Dimensions in mm VGH... / DN E G /4 P N M L Q J H R 4 x Rp 1/4 S T A B K 766m05/0502 F VGF... / DN x Rp 1/4 P 86 S T C D Q N M L J R A B K E F 766m04/ /18

16 Dimensions (cont d) Dimensions in mm VGF... / DN G G Rp 1/4 86 Rp 1/4 P Q N M L R 80 C D J H 2 x G /4 S E F A B K 766m07/0502 VGG / G 86 G Rp 1/4 Rp 1/4 J H DN SW 2 x G /4 T DN C D E 80 F 766m08/ /18

17 Dimensions (cont d) Dimensions in mm VGG ½ JDN DN SW 4 x Rp 1/4 S T 80 C D E F 766m01/0502 Mounting surface for actuator or AGA60 adapter flange for SQX... actuator 17/18

18 Dimensions (cont d) Table of dimensions Typ VGG VGG VGG VGG VGG VGG DN 1) 1/2" /4" 1" 1 1/2" 2" " A B C ) ) D E F G 110 G 110 H 68 J K L M N VGF VGF VGF VGF DN40 DN50 DN65 DN , VGH VGH VGH DN80 DN100 DN DN Nominal size, dimension for connection of medium 1) Flange conforming to ISO ) With stroke limitation ) Without stroke limitation R Number of boreholes; for standards for flanges and threads, refer to «Type summary gas valves» * Width across flats P ,5 22,5 22,5 22,5 Q R S T SW* kg 0,8 0,8 0,75 1,4 1,95 1,4 6 7,5 15, 17,9 16, 18,6 2,4 18/ Siemens HVAC Products GmbH Subject to change!