HORA Valves manufactures special control valves for water and steam designed for delivering top performance

Wherever energy is generated and distributed, whether in Germany or China, Russia or India: HORA actuators and control valves perform decisive functions. HORA Valves has more than 40 years of experience in the development and manufacture of products for regulating water and steam flow. HORA Power Technology delivers individual customized solutions with outstanding performance efficiency and durability along with all associated services.

With many years of engineering experience with Hora Valves in critical power generation applications in the UK Advanced Valve Solutions offers more than just products. In addition to holding joint patents with HORA Valves, Advanced Valve Solutions engineers have excellent working relationships with engineers and technical staff. This enables Advanced Valve Solutions to offer the right product for your application and the best technical support possible. Our popular technical forums, Vales & More, include a day spent with Hora engineers.

Our experience and expertise with Hora Valves has enabled us to help many UK power stations significantly reduce maintenance costs and downtime.

Advanced Valve Solutions has:

• Designed custom valves and associated trim
• Assessed critical spares stock levels to minimise downtime
• Provided valve diagnostics to predict failure and implement preventative maintenance

Advanced Valve Solutions UK Limited is the contact for HORA Valves in Great Britain.

HORA Valves products include:

Power products

• Control valves
• Steam conditioning valves
• Feed water Control valves
• Steam Cooling
• Minimum Flow Valves
• Drain Valves
• Water injection valves
• Desuperheater valves
• Turbine bypass valves
• Turbine shut-off valves
• Automatic recirculation valves (Pump protection)
• Valves for super critical boilers

Petro chemical

• Turbine bypass Valves
• Combi Feed Water Control Valves
• Steam Cooling

HORA Valves Projects

• Marchwood CCGT Power Station Cooled Desuperheater - Date: August 2013 · Cost Savings: £200,000 per year 
• Comtes 700
• Nuon heast storage
• High pressure steamboilers SNB

HORA Valves Technical Papers

• Two shift cooled desuperheater
• Two shift gate valves operation power plants
• Two shift feed water control valves
• Two Shift PRDS Paper

Related articles

• Servicing
• Valves & More
• The HORA iPhone App ValveMate

PERSTA is a market leader in the manufacture of high performance, forged steel isolating valves.

Part of the Siepmann Group, with their own forging shop, Persta are an established manufacturer with a flexible production process. In particular PERSTA's high pressure globe and gate valves are a benchmark within the valve industry.

PERSTA has more than 60 years of experience in the development, construction and production of valves. Modern equipment and comprehensive approvals in accordance with international standards guarantee high-quality products and flexible compliance with customer requirements. Technical developments in terms of pressure, temperature and tolerance call for highly stable materials with a dense, homogenous structure. The company’s core business consists in the development, production and distribution of high-quality industrial forged steel valves, variously augmented by valves made from hot-formed sheets and cast steel. PERSTA steel valves are distinguished by their high quality and reliability.

PERSTA’s high quality products, continuous innovation and business flexibility have helped them to become a sought after specialist for valves, gate valves and check valves. Today we have more than 50 distribution partners around the world. Application areas for our products include: plant engineering, pipe laying, boiler construction, chemical and petrochemical industries, conventional and nuclear power plants.

Advanced Valve Solutions UK Limited is the contact for PERSTA in Great Britain.

Persta products include:

Power products

• Stop check valves
• Gate valves
• Globe Valves up to PN630
• Check valves
• Globe Valves up to PN160

Petro chemical products

• Gate & Globe Valves
• Gate Valves
• Stop Check Valves

PERSTA Projects

• Persta Stop Check Valve Protects Pulrose Power Station From £1m Repair
• BASF SE TDI Europe
• High pressure steamboilers SNB

PERSTA Technical Papers

• Stop Check Valves
• Two shift gate valves operation power plants

Related Articles

• Servicing
• Valves & More

ZWICK Valves special butterfly valves designed for delivering top performance

ZWICK is a German manufacturer of high performance triple offset butterfly valves. ZWICK excels in short delivery times because of a flexible and effective organisation. ZWICK successfully passed the Shell TAMAP procedure and achieved the very low allowable Fugitive Emission leakage rates.

ZWICK is a leading manufacturer of valves which meet the highest requirements and quality standards. The product range contains metal-seated butterfly valves known as series TRI-CON, the check valves series TRI-CHECK and the TRI-BLOCK series, ZWICK’s Double Block and Bleed Design.

ZWICK Valves products include:

Power products

• Butterfly Valves

Oil & Gas

• Triple Exentrical Butterfly Valves

Petro Chemical

• Butterfly Valves

ZWICK Valves Projects

• Nieuwe WarmteWeg (DNWW)
• Nuon heat storage
• District heating Weurt
• Koppel leiding regio Arnhem

Related Articles

• Service

Two shift operation power plants

Many power stations, originally designed for base load applications, are now operating on a two shift, stop/start regime. Start/stops operations are causing an increase of operational issues due to the constant changing process parameters. These issues are additional thermal stress in the headers, drums, high temperature piping, valves and auxiliary equipment, leading to additional wear and tear. Without addressing the above issues, the life time of the components will decrease enormously.
It require other types of steam coolers, de-superheater by-pass valves, drains, feed water control valves, main steam HP and IP isolation valves, and stop check valves. These valves are designed for two shifting process, improve operational performance and reduce wear and tear.
One valve in particular, only seen in installations with an Alstom GT 24 or GT 26 gas turbine is the OTC feed water level control valve.
The following paper highlights the function and the role an OTC feed water control valve has, what problems are regularly seen and what solutions AVS can offer.

The worldwide introduction of wind and sun power and the new environmental requirements for coal fired stations gives an increasing demand on gas fired power stations to balance the grid and 
to make a reliable quick start and stop regime possible.



To start and to stop a modern CCGT installation cannot be done instantaneously. The gas turbine has a certain time to get up to speed and to switch from full speed no load to full load. It should be warmed through first. The rest of the power plant, mainly the HRSG, the waste heat steam boiler downstream of the gas turbine, the interconnecting steam pipework, the steam turbine and the complete cooling circuit have to be brought up to working temperature as well. 

This all has to be done within a certain time pressure to limit the starting costs and to supply as 
soon as possible to the grid. The demand to minimize the starting times is stronger in the continental theater due to the higher fuel costs. Remaining for all CCGT plants is the demand of being reliable and the need to be sure to be able to start the installation and to supply the electricity required 
to the grid...
(download de gehele paper (engelstalig) in PDF formaat hieronder)

The worldwide introduction of wind and sun power and the new environmental requirements for coal fired stations gives an increasing demand on gas fired power stations to balance the grid and 
to make a reliable quick start and stop regime possible.



To start and to stop a modern CCGT installation cannot be done instantaneously. The gas turbine has a certain time to get up to speed and to switch from full speed no load to full load. It should be warmed through first. The rest of the power plant, mainly the HRSG, the waste heat steam boiler downstream of the gas turbine, the interconnecting steam pipework, the steam turbine and the complete cooling circuit have to be brought up to working temperature as well. 

This all has to be done within a certain time pressure to limit the starting costs and to supply as 
soon as possible to the grid. The demand to minimize the starting times is stronger in the continental theater due to the higher fuel costs. Remaining for all CCGT plants is the demand of being reliable and the need to be sure to be able to start the installation and to supply the electricity required 
to the grid...
(download de gehele paper (engelstalig) in PDF formaat hieronder)

PERSTA is een vooraanstaand Duitse producent van gesmede klepafsluiters, schuifafsluiters en terugslagkleppen. Als onderdeel van de Siepmann groep beschikt men over een eigen smederij. Speciaal voor hoge druk en temperatuur appendages. De flexibele productie biedt de mogelijkheid “assemblies” te bouwen. Engineerd oplossingen met kostenbesparende systemen. PERSTA is marktleider in zeer snel aan te warmen schuifafsluiters en stop-check valves.

Het programma van PERSTA omvat

• Klepafsluiters
• Schuifafsluiters
• Terugslagkleppen
• Stop-check valves
• Bellow sealed valves
• Speciale kleppen en samenstellingen
• Kleppen voor ultra kritische stoomketels

Configuratie

Leverbaar met stopbusconstructie, balgafdichting, pressure sealed bonnet of blindflens.

• DN 50-1000, PN tot 40
• DN 50-300, PN tot 100
• DN 50-300, PN 160
• DN 50-700, PN 100-630 (PD 10-63)
• DN 10-50, PN tot 100 (class 800)

Materialen

• Staal: 1.0460, 1.0425, 1.4515
• Warmvast: 1.4901, 1.4903, 1.6368, 1.7335, 1.7383
• Edelstaal: 1.4571
• Edelstaal laagtemperatuur: 1.4308
• Overige materialen op aanvraag

Aansluitingen

• Flens
• Las
• Nippel < DN50
• ASME op aanvraag

Eigenschappen

• "Split wedge" constructie
• Door een rail geleide schuif (tapered parallel slide)
• Smeedstalen huis en deksel
• Niet-draaiende, stijgende spindel
• Gelagerde spindelmoer
• Montageflens aandrijving voorhanden
• Pressure seal volgens VGB-richtlijnen

Ontwerp bijzonderheden

Eendelig smeedstalen huis
In tegenstelling tot gietmateriaal geen kans op poreus materiaal of luchtinsluitingen,

robuust en geschikt voor zware belastingen
Extreem hoge opwarm gradiënten haalbaar.

Integrale geleidingsrail
Vrijwel wrijvingsloze slag in tegenstelling tot de parallel slide constructie

Opgelaste, geharde zitting (ca. 35-37 HRC)
Extreem slijtvast

Volle doorlaat (uitzondering DN 65/50 en DN 125/100)
Geen stromingsverandering rond de zitting

Verbinding tussen de spindel en schuif d.m.v. hamerkop
Een minimale speling in de stromingsrichting voorkomt enorme buigbelastingen op de spindel

Pressure seal
Betere afdichting naarmate de procesdruk toeneemt. Segmentring van onder gecentreerd en onderhoudsvriendelijk

PERSTA is een vooraanstaand Duitse producent van gesmede klepafsluiters, schuifafsluiters en terugslagkleppen. Als onderdeel van de Siepmann groep beschikt men over een eigen smederij. Speciaal voor hoge druk en temperatuur appendages. De flexibele productie biedt de mogelijkheid “assemblies” te bouwen. Engineerd oplossingen met kostenbesparende systemen. PERSTA is marktleider in zeer snel aan te warmen schuifafsluiters en stop-check valves.

Het programma van Persta omvat

• Klepafsluiters
• Schuifafsluiters
• Terugslagkleppen
• Stop-check valves
• Bellow sealed valves
• Speciale kleppen en samenstellingen
• Kleppen voor ultra kritische stoomketels

Configuratie

Leverbaar met stopbusconstructie, balgafdichting, pressure sealed bonnet of blindflens.

• DN 50-1000, PN tot 40
• DN 50-300, PN tot 100
• DN 50-300, PN 160
• DN 50-700, PN 100-630 (PD 10-63)
• DN 10-50, PN tot 100 (class 800)

Materialen

• Staal: 1.0460, 1.0425, 1.4515
• Warmvast: 1.4901, 1.4903, 1.6368, 1.7335, 1.7383
• Edelstaal: 1.4571
• Edelstaal laagtemperatuur: 1.4308
• Overige materialen op aanvraag

Aansluitingen

• Flens
• Las
• Nippel < DN50
• ASME op aanvraag

Eigenschappen

• "Split wedge" constructie
• Door een rail geleide schuif (tapered parallel slide)
• Smeedstalen huis en deksel
• Niet-draaiende, stijgende spindel
• Gelagerde spindelmoer
• Montageflens aandrijving voorhanden
• Pressure seal volgens VGB-richtlijnen

Ontwerp bijzonderheden

Eendelig smeedstalen huis
In tegenstelling tot gietmateriaal geen kans op poreus materiaal of luchtinsluitingen,

robuust en geschikt voor zware belastingen
Extreem hoge opwarm gradiënten haalbaar.

Integrale geleidingsrail
Vrijwel wrijvingsloze slag in tegenstelling tot de parallel slide constructie

Opgelaste, geharde zitting (ca. 35-37 HRC)
Extreem slijtvast

Volle doorlaat (uitzondering DN 65/50 en DN 125/100)
Geen stromingsverandering rond de zitting

Verbinding tussen de spindel en schuif d.m.v. hamerkop
Een minimale speling in de stromingsrichting voorkomt enorme buigbelastingen op de spindel

Pressure seal
Betere afdichting naarmate de procesdruk toeneemt. Segmentring van onder gecentreerd en onderhoudsvriendelijk

Stoomkoeling is het tegenovergestelde van oververhitten en noodzakelijk in alle stoominstallaties. Advanced Valve Solutions levert het complete gamma aan stoomkoelers, hierbij heeft elk type koeler zijn specifieke eigenschappen. Met behulp van geavanceerde CFD (Computer Fluid Dynamics) is het tevens mogelijk om stromingen te simuleren om zo tot een optimale, kostenbesparende constructies te komen.

Toepasbaar in

• Processtoom
• Tussenkoeling oververhitter - HP & IP inspuitkoelers
• Eindkoeler herverhitter
• Condensor beveiliging
• Overige koeltoepassingen

Configuraties

• Geregelde inspuitkoeler
• Venturi koeler
• Stoomkoeling met behulp van stoomverstuiving
• Statische inspuitlans
• "Cooled desuperheater"

Eigenschappen

• Altijd fijne verneveling van het inspuitwater
• Smeedstalen huis
• Ééndelig huis
• Geïntegreerde regelklep
• Enkel- of meertraps drukreductie
• Anti-cavitatie binnenwerk
• Vanwege de regeling optimale drukval over inspuitnozzles

Voordelen

• Vanwege geklemd binnenwerk onderhoudsvriendelijk
• Geen aparte inspuitregelklep noodzakelijk
• Anti-cavitatie binnenwerk
• Afdichting in het koude gedeelte
• Geen lasverbinding in de staart
• Optimaal sproeibeeld d.m.v. ideale drukafbouw over nozzle
• Thermoshock vrij!
• Groot regelbereik

Fabrikant

HORA is een Duitse leverancier van hoge druk water- en stoom regelappendages. Het hele programma regelkleppen voor een moderne centrale, zowel kolen gestookt als CCGT (gasturbine met afgassenketels en stoomturbines) centrales alsook stoomnetten kunnen compleet door ons worden geleverd. Samen met het uitstekende R&D team van HORA speuren wij naar verbeteringen voor de kleppen in de water stoom cycle. Een flexibel en toegewijd bedrijf, producent van “engineerd” regelkleppen.

• Regelkleppen
• Stoom omvorm ventielen
• Inspuitwater regelkleppen
• Stoomkoelers
• Cooled desuperheaters
• Turbine bypass kleppen (PRDS)
• Turbine snel sluitkleppen
• Automatische recirculatie ventielen
• Kleppen voor ultra super kritische stoomketels