- Valores de KVS personalizados
- Características individuais de controle
- Passagem total disponível
- Curva característica igual porcentagem ou linear
- Automação econômica
- Posições de controle facilmente reproduzíveis
As características de construção das válvulas de controle RH e RH-A são as mesmas das válvulas macho sem espaço morto, com bucha em PTFE
ou revestidas em PFA/FEP. Diversos materiais para construção do macho e do corpo são disponíveis, atendendo assim as mais variadas aplicações.
Caso necessário também podem ser fornecidas com camisa de aquecimento.
Operating temperatures < -30°C and > 220 °C have to be checked and approved by AZ according to the operating conditions. Besides the P/T value of the sleeve the limitations of the valve bodies also have to be considered. Please refer to the EN 12516-1 resp. ASME B16.34 in order to choose a proper pressure rating (PN/class). The shown values refer to austenitic stainless steel 1.4408 (A351 Gr. CF8M). 1) For operating temperatures below -10°C low temperature / austenitic steels are required. 2) Sleeve: There are different sleeve materials / compounds available.
Standard body materials • Carbon Steel 1.0619, ASTM A216 WCB • Stainless Steel 1.4408, ASTM A351 CF8M • Stainless Steel 1.4308, ASTM A351 CF8 • Unalloyed stainless steel casting (low Temp.) 1.1138, LCC/LCB/A352 Standard plug materials • Stainless Steel 1.4408, ASTM A351 CF8M • Stainless Steel 1.4308, ASTM A351 CF8 Special materials • Ductile cast iron ENJS 1049, ASTM Gr 60-40-18 / A395 • Alloy • Monel • Nickel • Zirconium • Titan • Tantal • other materials on request
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As standard, there are ten plugs forms available per valve size, consisting of five linear and five equal percentage control characteristics. Type “EXTRA” full bore plug valves with equal percentage control characteristics are recommended for very large flow rates (only RH and RH-S types). Furthermore, bespoke plug forms can be calculated and designed according to customer-specific requirements that combine, for example, control properties and free passage.
Type RH, linear control characteristics Type RH, equal percentage control characteristics Model structure The data was determined by flow simulation and based on the VDI/VDE 2173 with a permissible deviation of +/- 10% (medium = water 20°C, pressure loss Δp = 1 bar). Definition Kvs The KVS value designates the maximum possible throughput for a valve with a 100% opening Definition Kv The flow coefficient Kv [m3/h] is a specific volume flow for the following conditions: – The pressure loss (Δp) via the valve is 105 Pa (1 bar) – The medium is water with a temperature between 278 K and 315 K (5°C to 40°C) Definition Cv The flow coefficient Cv is a valve flow coefficient that does not correspond to S.I. units. It represents the number of U.S. gallons of water which flow through a valve with a pressure loss of 1 psi (0.689 mbar) at a temperature of 40°F to 100°F (4°C to 38°C) within a minute. Cv = Kv/0,865
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