A sprayer assembly comprises a nozzle section and a valve section. The nozzle section includes a valve housing having a valve element at its front end defining a spray outlet, and a valve seat inserted into its rear end. The valve section includes a plunger reciprocably mounted in a solenoid, and a valve stem mounted coaxially in a front end of the plunger for engaging the valve seat. The valve stem can be replaced by removing the valve section and pulling the stem out of the plunger.