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POLNA has proven itself as a reliable and timely producer and provider of high quality equipment for central lubrication systems, particularly as far as pumps and their parts are concerned.
Jerzy Bogucki
Biuro Inżynieryjno Techniczne MAR – TET s.j.
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CONTROL VALVES TYPE Z WITH QUICK CLOSURE CIRCUITS FOR GASES
Control valves with pneumatic actuators fitted with quick closure circuits are designed for burners and other gas appliances, where they control the flow, and in case of emergency, cut the flow off.
Time to full closure is less than 1 second.
| Nominal sizes /diameter/ | DN15; 20; 25; 32; 40; 50; 65; 80; 100; 150; 200; 250 |
| Nominal pressure |
• PN10; 16; 25; 40
• CL150; CL300 |
| Flow ratio | Kvs: 0,01...160 m3/h |
| Ambient temperature |
- 40°C ... + 80°C |
| Media temperature |
max. + 220°C |
|
Leakage class |
VI class acc PN-EN 60534-4 |
| Max. stroke | 38 mm |
| Body materials |
carbon steel GP 240 GH (1.0619), G20Mn5 (1.6220), WCB stainless steel GX5CrNiMo 19-11-2, CF8M Use of other materials is possible but must be agreed upon. |
| Non-catalogue products | We can adjust these parameters to your individual needs. In such cases, please contact our technical support specialists. |
- Possible applications:
- range of nominal sizes from DN15…250 for nominal pressures PN10…40; CL150; CL300,
- all surfaces exposed to fluids are resistant to flammable gases and lubricants;
- various materials of valve body and internal parts, adapted to specific working conditions
- wide range of flow coefficients and control characteristics,
- easy assembly and dismantling of valve internal parts for maintenance and service,
- possibility of mating with revers-action multi-spring actuators, types R-250; 400; 630; 1000 with no extra parts (keeping the number of springs),
- high tightness of closure due to application of soft seats,
- reliable connection between actuator stem and valve, and between seat and body,
- maintenance-free bonnet packings:
- sylphon bellows s/s with FVH-PTFE or TA-LUFT packing,
- competitive prices due to simple and functional design of valves and actuators and used materials,
- design and production process meet the requirements of Quality Management System ISO 9001 and Directive
- 97/23/EC, and regulations of AD2000 Merkblatt, designated for installation on pipelines.
- valves manufacture process meets requirements of ATEX Directive 94/9/EC.
