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PRODUCTS 2014

PRODUCTS 2014
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PRODUCTS 2014

Product catalog summary

Overview

This technical document provides an extensive reference on industrial valves and strainers, covering 45 years of manufacturing experience. It details component materials, dimensional data, operating conditions, performance characteristics, and best practices for valve selection, installation, and maintenance.

1. Components and Materials

The valves comprise various components made from specific materials to ensure durability and performance under different conditions:

  • Body and Yoke: Cast irons and steels such as EN-GJS-400-18-LT, EN-GJL-250, GP 240 GH+N, GX5 CrNiMo 19-11-2, ASTM A 216 WCB.
  • Seats and Discs: Stainless steel grades 1.4021, 1.4301, 1.4370, 1.4401, with options for welded or pressed-in seats.
  • Bellows: Stainless steel 1.4541.
  • Gaskets and Packing: Graphite combined with stainless steel (AISI 316), Aramid fibers with NBR, EPDM O-rings.
  • Bolts, Screws, Tie Rods: Carbon steel or stainless steel depending on valve type.
  • Handwheels: Pressed steel.
  • Additional Parts: Brass bushes, leadscrews, zinc-plated steel drain plugs, studs, nuts.

2. Operating Conditions

  • Temperature ranges from -10°C up to 400°C depending on valve type and material.
  • Pressure ratings vary between 3 bar and 100 bar, decreasing with increasing temperature.
  • Specific pressure limits are provided per material, e.g., EN-GJL-250 bodies rated up to 19.6 bar at low temperatures, decreasing to 5.5 bar at 426°C.

3. Dimensions and Performance Data

Detailed dimensional tables cover nominal diameters (DN) from 15 mm to 300 mm, including parameters such as diameter (D), length (L), height (H, H'), volume (V), and weight (Kg). Flow coefficients (Kv) are provided for each DN and valve opening percentage (20% to 100%), indicating flow capacity in m³/h. Kv values increase with valve size and opening degree.

4. Valve Features and Design Highlights

  • Backseat: Safety feature on the stem to prevent leakage.
  • Double Anti-Friction Bearings: Ensure smooth operation and durability.
  • Rotating and Non-Rotating Discs and Stems: Configurations tailored to application needs.
  • Pressed-In or Welded Seats: Enhance sealing and longevity.
  • Opening Index with Anti-Rotation Function: Indicates valve position and prevents stem rotation.
  • Lubricators: Integrated for ease of maintenance.
  • TA-Luft Approval: Compliance with environmental emission standards.

5. Valve Types and Construction Variants

  • Rotating Disc Valves: Featuring anti-friction bearings and backseat safety.
  • Spring-Loaded Valves: Equipped with zinc-plated or stainless steel springs for vertical installation.
  • Screen Valves: Wire cloth screens in stainless steel 1.4301 with light and fine mesh options, sizes from ½" to 2" and DN 15 to DN 300.

6. Maintenance

Valves are designed for minimal or free maintenance, emphasizing reliability and ease of service. Regular inspection of lubricators and packing is recommended to maintain performance.

7. Standards and Approvals

All valves comply with TA-Luft environmental emission standards, ensuring suitability for applications requiring regulatory compliance.

8. Installation Recommendations

  • Install valves with balanced discs so that pressure is applied on the disc side (reverse installation) to ensure proper function and longevity.
  • Observe pressure limits relative to temperature and material to maintain safety.
  • Use valves with anti-rotation and backseat features for enhanced operational reliability.

9. Summary of Key Specifications

Valve TypeBody MaterialTemperature Range (°C)Pressure Range (bar)DN Range (mm)Flow Coefficient (Kv) Range (m³/h)
Various modelsEN-GJS-400-18-LT, EN-GJL-250, GP 240 GH+N, GX5 CrNiMo 19-11-2, ASTM A 216 WCB-10 to 4003 to 100 (depending on type and DN)15 to 3004.6 to 1493 (varies by DN and valve)

10. Recommendations and Best Practices

  • Select valve materials and designs based on specific operating temperature and pressure requirements.
  • Consider valve size and Kv values to ensure adequate flow capacity for the application.
  • Utilize valves with TA-Luft approval for environmental compliance.
  • Regularly inspect lubricators and packing to maintain sealing and operational efficiency.
  • Prefer valves with anti-rotation and backseat features to enhance safety and reliability.
  • For high-pressure or high-temperature applications, ensure pressure ratings are not exceeded.

Conclusion

This document is a comprehensive technical guide for engineers and technicians involved in the selection, installation, and maintenance of industrial valves and strainers. It provides critical data on materials, dimensions, operating limits, flow characteristics, and design features to support informed decision-making in diverse industrial environments.

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Catalog excerpts

PRODUCTS 2014-2

OLTRE 45 ANNI Dl ESPERIENZA Da oltre45 anni MIVAL produce in Italiadiversi tipi di valvolame industriale con un'alta specializzazione e competenza per le Alia produzione standard altamente robotizzata sono stati affiancati nuovi modelli, la fig. 2010 per acqua, che sta riscuotendo successo per la versatility dei suoi impieghi e la fig. 2012, la prima valvola MIVAL brevettata, un' assoluta novita nel campo degli impianti industriali e navali. Da sempre MIVAL garantisce la qualita dei suoi prodotti assicurando la tenuta perfetta anche nelle valvole con tenuta metallica, disponibili a vite interna...

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PRODUCTS 2014-3

Since 1967 MIVAL produces in Italy different types of industrial valves and is highly specialized in bellows sealed globe valves. New valves, such as fig. 2010 for water installations, which is highly appreciated for its versatility and fig. 2012, the first patented valve by MIVAL, that is a great innovation for industrial plants, have been added to the standard valves, manufactured through highly affordable robotic Since ever MIVAL guarantees the quality of its products and the perfect tightness of its valves with metal seats, available with inside and outside screw, for low and high pressure...

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PRODUCTS 2014-4

QUALITA' CERTIFICATA Dal 1995 MIVAL e certif icata UNI EN ISO 9001:2008 per la produzione e la commercializzazione di valvole per impianti industriali; inoltre, tutte le fasi del la progettazione e della produzione sono garantite da numerose certificazioni tra cui la direttiva 97/23/CE (P.E.D.), la direttiva 94/9/CE (ATEX) inoltre tutte le valvole a soffietto sono certificate TA Luft per assicurare la tenuta delle valvole verso I'esterno garantendo 0 emissioni. Attenti al rispetto dell'ambiente I'azienda ha installato sul tetto dello stabilimento un impianto fotovoltaico della potenza di 172...

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PRODUCTS 2014-5

CERTIFIED QUALITY Since 1995 MIVAL is certified according to UNI of valves for industial installations; moreover, the engineering and the production processes are certified according to the European Directive Luft which guarantees zero leakage to the To protect the environment MIVAL installed on the roof of its factory a photovoltaic power plant of 172 Kw which produces an average of 190.000 Kwh per year thus significantly reducing emissions of C02 into the environment Another key issue of MIVAL is the affordable organization of its sales department and the considerable range of valves kept in...

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PRODUCTS 2014-6

Valvola a duplice funzione esente da manutenzione a vite esterna con soffietto + filtro raccoglitore di impurita'a Double function valve outside screw maintenance free with bellow + Y-pattern sediment collecting strainer Caratteristiche principali di serie Main standard features Doppia ralla di scorrimento antifrizione Double anti-sliding bearing Stelo saliente non rotante Rising not rotating stem Rise limiter Possibili campi di impiego Impianti di trasmissione calore, centrali termiche, caldaie e serbatoi, impianti di teleriscaldamento, applicazioni con olio diatermico, ecc. Heat transfer systems,...

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PRODUCTS 2014-7

KV alia percentuale di alzata per versione di regolazione Kv at stroke rate for regulation version Condizioni di esercizio/ Working conditions Dimensioni cestello e guarnizioni standard Dimensions screen and gaskets standard N0TA: a protezione dell'integrita della sede il cestello non appoggia direttamente ma si incastra su un anello di centraggio, il quale viene direttamente saldato al cestello, W07E to guarantee the tightness of the seats, the screen is not supported by the seat itself, but is fitted on a centring ring, which is directly welded on the screen. N0TA: Eventuali altre filtrazioni...

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PRODUCTS 2014-8

FValvola wafer per acqua esente manutenzione a cuneo gommato Maintenance free wafer-type valve for water installations with rubber coated wedge Caratteristiche principali di serie Main standard features I Face to face dimension i Ghiera limitatrice di apertura per un veloce riposizionamento Opening stop nut for quick re-positioning Indice graduate visibile su due lati Position indicator visible on both sides Position indicator Dispositivo di bloccaggio con possibility di lucchettaggio Locking device with padlock system possibility Otturatore rivestito in gomma EPDM (Max 120°C) EPDM coated valve...

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PRODUCTS 2014-9

KV alia percentuale di alzata Condizioni di esemzm/Working conditions Accessori per la regolazione delle portate: Accessories for flow regulation: Per una rilevazione attendibile dei valori di portata e prevista a richiesta la fornitura dei seguenti accessori: - un tronchetto flangiato da applicare a monte della valvola - un orifizio calibrato in acciaio inox - due prese piezometriche 0 14 GAS opportunamente prolungate per un agevole La valvola e il relativo tronchetto sono prowisti delle tre guarnizioni necessarie, fornite gia fissate alle flange To obtain a reliabe measurement of flow rates...

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PRODUCTS 2014-10

avviato a vite esterna ghisa grigia, esente manutenzione led flow valve outside screw with bellows, maintenance free Caratteristiche principali di serie Main standard features Otturatore rotante Rotating disc Sede mandrinata Pressecl-in seat Possibili campi di impiego Impianti di trasmissione calore, centrali termiche, Heat transfer systems, thermal power stations, industrial Acqua calda e/o surriscaldata, vapore, aria, ecc. Hot water and/or overheated water, steam, air, etc. Disco antifrizione Antifriction disk Pressed steel Carbon steel

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PRODUCTS 2014-11

KV alia percentuale di alzata figura 61/R Kv at stroke rate item 61/R Condizioni di esemzm/Working conditions E' necessario I'uso dell'otturatore equilibrato quando la pressione di esercizio supera i seguenti valori It is necessary to use the balanced disc when the working pressure is over the following values NOTA: Utilizzando una valvola con otturatore equilibrato e indispensabile installarla al contrario, cioe con la pressione sopra I'orturatore NOTE: Using a valve with balanced disc is it essential to install it in reverse way, that is with the pressure on the disc Varianti costruttive Manufacturing...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.