Far to hot for you, or for the resistor?
Two 47 ohm resistors in parallel would give you 12/(47/2+12.6/0.15) = 112 mA through the circuit, and each resistor sees half of that or 0.056×0.056×47 = 0.15 watt which is well within spec for a 1/4 watt resistor. See the graph here for how using more resistors lower the power dissipation for each individual resistor.
If you’re still concerned, you could try shorting the resistor. The valve can handle the full 12 V just fine.