Question: Wade-Dahl-Till valve was partially built by the novelist of what nationality?

Context articles: A1 motorway (Romania)
Wade-Dahl-Till valve
Lehigh Valley Multi-Purpose Sport Complex
Roald Dahl
Gate valve
Aortic valve replacement
LMS Stanier Class 5 4-6-0 44686/7
St Clair Energy Centre
Cancelled expressways in Toronto
Antonov An-225 Mriya

The A1 motorway (Romanian: "Autostrada A1" ) is a partially built motorway in Romania, planned to connect Bucharest with the Banat and Crișana regions in the western part of the country.
 When completed it will be 580 kilometers long and it will span the country on the approximative south-east to north west direction.
 The motorway starts in the western part of Bucharest and connects the following major cities: Pitești, Sibiu, Deva, Timișoara, Arad, reaching the Hungarian M43 motorway near Nădlac.
 As the motorway is built along the Trans-European Transport Networks Rhine-Danube Corridor the construction receives 85% funding from the European Union.
The Wade-Dahl-Till (WDT) valve is a cerebral shunt developed in 1962 by hydraulic engineer Stanley Wade, author Roald Dahl, and neurosurgeon Kenneth Till.
The Lehigh Valley Multi-Purpose Sport Complex (also known as Williams Township Ballpark) was a partially built, 6,400-seat stadium that was slated to be built in Williams Township, Pennsylvania, near Easton.
 The stadium was never completed, and the partially constructed building was demolished in 2005.
Roald Dahl ( , ] ; 13 September 1916 – 23 November 1990) was a British novelist, short story writer, poet, screenwriter, and fighter pilot.
 His books have sold more than 250 million copies worldwide.
A gate valve, also known as a sluice valve, is a valve which opens by lifting a round or rectangular gate/wedge out of the path of the fluid.
 The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is desired.
 The gate faces can be parallel, but are most commonly wedge-shaped.
 Gate valves are primarily used to permit or prevent the flow of liquids, but typical gate valves shouldn't be used for regulating flow, unless they are specifically designed for that purpose.
 Because of their ability to cut through liquids, gate valves are often used in the petroleum industry.
 For extremely thick fluids, a specialty valve often known as a knife gate valve is used to cut through the liquid.
 On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening.
 This means that flow rate does not change evenly with stem travel.
 Also, a partially open gate tends to vibrate from the fluid flow.
 Most of the flow change occurs near shutoff with a relatively high fluid velocity causing gate and seat wear and eventual leakage if used to regulate flow.
 Typical gate valves are designed to be fully opened or closed.
 When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.
Aortic valve replacement is a procedure in which a patient's failing aortic valve is replaced with an artificial heart valve.
 The aortic valve can be affected by a range of diseases; the valve can either become leaky (aortic insufficiency) or partially blocked (aortic stenosis).
 Current aortic valve replacement approaches include open heart surgery via a sternotomy, minimally invasive cardiac surgery (MICS) and transcatheter aortic valve replacement (TAVR).
The last two of the 842 LMS Stanier Black Fives, numbers 44686 and 44687 were constructed by British Railways at Horwich Works in 1951.
 They were fitted with Caprotti valve gear, raised running plates without splashers, a double chimney and SKF roller bearings on all axles.
 Caprotti valve gear had previously been fitted to a batch of twenty Black Fives, nos. 44738-57, built in 1948.
 The valve gear on these was driven by one drive-line between the frames, driven from the leading coupled axle.
 Although these locomotives developed a great deal of power at high speeds and were free in coasting, acceleration at low speeds was poor.
 44686 and 44687 were fitted with a modified form of valve gear, with an external shaft on each side, driven by a worm gear mounted on a flycrank attached to the driving axle.
 The British Caprotti valve gear was a new development of Caprotti valve gear by the Associated Locomotive Engineers, under the leadership of L.A. Daniels.
St Clair Energy Centre is a natural gas power station owned by St Clair Power LP, in St. Clair, Ontario.
 The plant is primarily used to supply power onto the Ontario Grid.
 The plant was partially built from equipment originally intended for a partially built, four-unit CCGT in Nelson Township, IL.
The cancelled expressways in Toronto were a planned series of expressways in Toronto, Ontario, Canada that were only partially built or cancelled due to public opposition.
 The system of expressways was intended to spur or handle growth in the suburbs of Toronto, but were opposed by citizens within the city of Toronto proper, citing the demolition of homes and park lands, air pollution, noise and the high cost of construction.
 The Spadina Expressway, planned since the 1940s, was cancelled in 1971 after being only partially constructed.
 After the Spadina cancellation, other expressway plans, intended to create a 'ring' around the central core, were abandoned.
The Antonov An-225 "Mriya" (Ukrainian: Антонов Ан-225 "Мрія" (dream or inspiration) , NATO reporting name: "Cossack") is a strategic airlift cargo aircraft that was designed by the Antonov Design Bureau in the Ukrainian SSR within the Soviet Union during the 1980s.
 It is powered by six turbofan engines and is the longest and heaviest aircraft ever built, with a maximum takeoff weight of 640 t .
 It also has the largest wingspan of any aircraft in operational service.
 The single example built has the Ukrainian civil registration UR-82060.
 A second airframe with a slightly different configuration was partially built.
 Its construction was halted in 1994 because of lack of funding and interest, but revived briefly in 2009, bringing it to 60%-70% completion.
 On 30 August 2016, Antonov agreed to complete the second airframe for Aerospace Industry Corporation of China (not to be confused with the Aviation Industry Corporation of China) as a prelude to AICC commencing series production.