Motorised Valves
mario w jeans e pantaloni fujifilm finepix f455 yeti5 ab sat kyes radio fm mp3 sorridi un uomo senza importanza candle in the wind elton john diffusori genelec dvd-r tx giorgia spirito libero toner lexmark t610 wwe news porcell my to my dvd recorder multistandard la tigre in corpo i lanci asus a9550 agp8x 256mb dvi tv out midi italiani anni 60 thinkpad x once upon a time anastasia www statiuniti it samba para ti software portatile lucky luke. vol. 04 incontri urbino aepyceros guta sorinel copilul de aur reggiseno al silicone www eva robins bordo cornice philips - 190s6fs www tuntun v nove settimane e mezzo film dvd carillon morricone niurka calendario erika del grande fratello i gangsters benassi bross ashley massaro batteria sony z5 highway to hell kensington scanner per biglietti toner canon ep-72 samsung yp-t6z lettore mp3 fm sd usb pieces auto lancia thema decapitazione ultimo ostaggio dvd scarica geforce 6600 portatili isola famosi 2 il museo degli scandali distruggi fogli chose engine la calda bestia scanners ufficio porno francese cratis lcd 4 ms catria defecare the fantastic oceans agenzia immobiliare toscana pesao brasile biglietti pieghevoli raul borges driver motorola v70 luna mezzo mare lesbica cerca gay scope elettriche siemens musica de chayanne vino sfuso telefonia wind a padova accessori jam fotomontaggi porno celebrita italiane agenzia immobiliare marina massa jessie matthews convertitore midi mmf balletto napoli belinea lcd 101751 burke testina canon bjc 4000 castle defend cray david brel jobs in england fulmini a ciel sereno dedica nascita asus fsb 1066 p5ad2 lionel ri pershing the reasons calendario divieti di circolazione mezzi pesanti il vento dell esr mondia orologi abbasso lamore tps france new cods t630 ericsson mike tyson boxing software corso inglese decoder unico sto gia bene gessato colin farrel and playmate benq fp937s mercurial vapor 42 calendario arca francesco joe sentieri dragonetti basi karaoke scaricare gratis hitachi telecamera dvd requisiti di eta per una cessione del quinto dare per un hero nikon 5600 light lesbo over 50 scugni radio it cast step by step hyundai b70a donne in cinta brocche caratteristiche paris hiltion metameri cumbanchero ati x850 xt platinum edition pc monitor doppia sim per nokia 6600 kate ritchie profumo zegna compo com faretti illuminazione foto aprilia gulliver lidia video analsexy logitech mx 3100 zoo ticon porcona digital theater sgt 280 a6 1.8 woofer 13 cd verbatim ball torture rum and cocaina simpathy for the devil radio portatile sony suoneria rock samsung water pik cordless joystick ps2 prove ferrari eyez blog left outside alne il segreto del lago la fabbrica di plastica motorola batteria v635 adattatore cassette auto caixa tre morti per giulio il nostro agente a casablanca gruppo c asian big tits single site hp multifunzione a colori chattiamo gratis dvd con hard disk lg coo bmw 01 acrobatica el debate video americano giustiziato asus p505 deluxe sankt michel lazzarella nino d angelo pictures genifer lopez hub switch 10 100 24 porte comunicazione politica masterizzatore interno 16x gianni e pinotto cartone futurama porno foto il signore degli anelli dvd origini del nome grand hotel palazzo carpegna dual fan bottega bosch asciugabiancheria tre vivi tre morti video gabry itt mercure plus btime cybill shepherd it s all right musiche viennesi volkswagen trucchi di yu gi oh computer palmare corse dei cavalli nuove tesi san paolo This article is about motorised valves used in Central Heating systems. Motorised valves are a type of electrically actuated valve (others include solenoid valves and valves using electrically-generated thermal effects).
Motorised valves generally comprise:
- a synchronous electric motor
- gears to reduce the speed and increase the torque output of the motor
The motor and gears are often combined in a package known as a Synchron motor.
- a linkage from the output gear to the hydronic part of the valve
- one or more switches (usually microswitches) actuated by, for example, a cam attached to the output linkage
- a spring: see below
- the above components usually comprise one module, often known as the 'head', which may be detatched from the parts below for repair or replacement.
- a valve controlling flow of water in the hydronic system, actuated by the head: this part is often known as the 'body'.
Configurations of motorised valve
Valves are commonly found in the following configurations:
2-port
The valve has 2 pipe connections (ports) and permits or blocks flow between the ports depending on whether it is actuated or not. Flow is permitted when the valve is actuated and blocked in its resting state.
3-port
The valve has 3 pipe connections, in a T formation. The centre leg of the T is the inlet and the two short arms are the outlets, usually referred to as ports A and B. Actuation controls whether the flow from the inlet passes to the A or B port. In the resting state flow is to the A port.
There are two types of 3-port valve:
- Diverter valve
- This is a simple change-over version of a 2-port valve: when the valve is actuated all flow is diverted to the B outlet.
- Mid-position valve
- In this type of valve there is a stable state in which flow from the inlet can pass to both (A and B) outlet ports simultaneously. This type of valve is commonly found in domestic central heating systems where it controls flow of hot water from a boiler to hot water and radiator circuits in a Y-plan system configuration.
Types of motorised valve
Spring return valves
In these types when power is applied the motor and gears act against the force of a spring to operate the valve. When power is removed the spring returns the valve to its resting position. In a 2-port valve this is the closed position. In a 3-port valve the resting position is where flow from the inlet passes to the A port.
These types of valve consume power whenever they are open (and, in the case of 3-port valves, often even when they are not). In 2-port valves the motor runs until the valve is fully open and then stalls as the actuator mechanism cannot move any further. 3-port valves are more complicated: a description can be found in the uk.d-i-y FAQ and here is a diagram showing a 3-port valve in a Y-plan CH system
Motor open/motor close valves
In these types of valve the motor is used to drive the motor from one position to the next. Switches in the mechanism stop the motor when it has reached its desired position.
2-port
This type of valve changes from it closed to its open position when power is applied to one terminal, and from open to closed when power is applied to another terminal.
ENERGISE ENERGISE
TO CLOSE TO OPEN
| |
white yellow
| |
o o
/ /
o/ o o/ o------- orange ----> TO BOILER
| |
| |
----------- -----------
|
-------
| |
| MOTOR |
| |
-------
|
blue
|
NEUTRAL
Switches are shown in their non-actuated states which occur
when the valve is neither fully open nor fully closed.
The switch on the left operates when the valve reaches its closed position.
The switch on the right operates when the valve reaches its open position.
These types of valves are occasionally found in domestic central heating systems: usually as Satchwell or Sunvic valves with grey plastic heads. (Note however that Sunvic also make almost identical spring-return valves.)
If a motor-open/motor-close valve is replaced by a spring-return valve, or vice-versa, the controls wiring must be modified to suit. In the case of replacing a spring-return with a motor-open/motor-close valve this requires change-over contacts at the room thermostat (or progstat) and an extra wiring conductor between the 'stat and the valve.
| This type of valve is also found in non-domestic installations. |  Industrial 2-port motorised valve The large orange box on the right houses the motor and gears. The smaller orange box on the left contains the switches. |
3-port
Sunvic's SDMV series 3-port valves are motor-open/motor-close types but are wired identically to spring-return valves.
These Switchmaster valves with bright blue plastic heads are found in some older domestic installations. The author is unsure whether the wiring of these differs from that for spring-return valves.
.jpg)
.jpg)
.jpg)