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Control valves type Z33 - POLNA S.A.

Control valves type Z33 (previous name: BR33) represent one of the valve designs, where change in flow ratio is achieved through an eccentrically set rotary plug.

Such structures are particularly useful for control of flow under heavy-duty conditions, with high probability of cavitation and erosion.

Possibility of obtaining high flows and a wide range of material and design variants make them ideal for application in many branches of industry, such as power generation, mining, metallurgy, chemical and petroleum industry, food industry, paper industry etc.

We can adjust the control valve to match your individual needs.

Nominal sizes DN25; 40; 50; 80; 100; 150; 200; 250; 300; 400; 450
Nominal pressure • PN 10, 16, 25, 40, 63 • CL150; CL300
Flow ratio 3 ... 2160 m3/h
Control characteristics linear, equal percentage
Rangeability 50:1
Leakage class IV class acc. to PN-EN 60534-4 VI class acc. to PN-EN 60534-4 class from B to G acc. to PN-EN 12266-1
Media temperature - 40 ... + 450°C
Body materials carbon cast steel GP 240 GH (1.0619), WCB carbon cast steel for low temperatures G20Mn5 (1.6220) acid-resistant cast steel GX5CrNiMo 19-11-2 (1.4408), 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 specialist. In the menu: “Non-catalogue version control valves” and “New products” we present the following examples.
  • one-piece valve body (cast with the throttle), except for the shaft sealing chamber, there are no static or dynamic seals
  • the absence of a “tear-off” torque between the plug and the socket
  • possibility of changing the KvS, without changing the plug or socket
  • easy replacement of the rotationally symmetrical plug
  • the extended throttle chamber allows the use of a double shaft seal that meets the “low emission” standard and meets the TA-Luft conditions
  • the same KvS factors for “hard and soft” sockets
  • a leakage rate of less than 0.01% KvS for “hard” sockets (“metal-to-metal”)
  • same flow direction for “hard” and “soft” sockets
  • an externally accessible connection between valve and actuator, allowing the actuator to rotate relative to the valve in 90° increments
  • possibility of special versions: with a heating jacket, with anti-erosion properties, for crystallizing media
We can adjust the control valve to your individual needs. In such cases, please contact our technical support specialists.


ul. Obozowa 23 Str
37-700 Przemyśl

TEL: +48 16 678 66 01
E-MAIL: sekretariat@polna.com.pl

KRS: NATIONAL COURT REGISTER: 0000090173 dated 12.02.2002 r. Provincial Court in Rzeszów, XII Division of National Court Register
COMPANY ID: 650009986     NIP: 795-020-07-05     BDO: 000030128
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