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Three-way control valves type Z3

Applied in automatic and remote control installations as flow control elements to adjust flow of liquids and gases. Type Z3M is designed to mix two streams of medium, whereas type Z3R is designed to split one stream into two.

Recommended for application in city-heating and HVAC systems, as well as many branches of industry. They can be delivered with P/R actuators (basic option) or with P1/R1; P3/R3 actuators (upon request) electric actuators, manual drive type 20 or with no drives.

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

Nominal sizes DN15; 20; 25; 32; 40; 50; 65; 80; 100; 150; 200; 250
Nominal pressure • PN10; 16; 25; 40 • CL150; CL300
Flow ratio 0,63 ... 320 m3/h
Control characteristics linear
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 - 196 ... + 450°C
Body materials grey cast iron EN-GJL 250 ductile cast iron EN-GJS 400-18LT 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.
  • wide range of nominal dimensions, DN15…150 for nominal pressures PN10…40; CL150; CL300
  • various materials of valve body cast and internal parts, adapted to specific working conditions
  • wide range of flow coefficients
  • reduction in aggressive and toxic media emissions to the environment through application of bonnet packings meeting the requirements of TA – LUFT
  • easy assembly and dismantling of valve internal parts for maintenance and service
  • high durability and reliability due to application of top-class materials and surface improvement processes (burnishing, stelliting, heat treatment, CrN coatings)
  • possibility of matching with P/R multi-spring actuators (basic option), P1/R1. Full reversibility of actuator operation and changing the spring range with no extra parts
  • optional fitting of pneumatic actuators with manual drive
  • possibility of performing diagnostics of “valve-actuator” system due to application of smart electro-pneumatic
  • positioners
  • high tightness of closure due to the application of soft valve seats (with PTFE seals in the whole range of flow coefficients
  • same flow ratios and control characteristics for “hard” (metal-to-metal)
  • and “soft” (metal-gasket) seats
  • reliable connection between actuator stem and valve, as well as between screwed in seat and body,
  • top-class flat and bonnet packings
  • wide range of electric actuators,
  • possibility of matching with 20 or NN type manual drives
  • possibility of special executions: for oxygen, hydrogen, acid gases containing H2S; for explosive atmospheres as per 94/9/EC – ATEX
  • competitive prices – as a result of a simple and functional design of valves and actuators, as well as applied materials
  • the 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
We can adjust the control valve to match your individual needs. In such cases, please contact our technical support specialist.


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
SHARE CAPITAL: 3.710.992,60 PLN
PAID CAPITAL: 3.710.992,60 PLN
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