High Pressure Regulating Valve

TM 55-1905-223-24-7

i. High Pressure Regulating Valve. Behind the high pressure by-pass valve, and connected to the valve, is the high

pressure regulating valve (9, FIGURE 1-4, Sheet 2. This valve restricts flow downstream of the RO modules causing the

pump discharge pressure to rise to the factory set 800 psi. The bolt on top of the regulator adjusts the set point to

maintain this pressure

j. High Pressure Pump. The high pressure pump (10, FIGURE 1-4, Sheet 2) is a positive displacement low-volume

pump mounted in the left side of the watermaker on the resilient mounted plate which also supports the three-horsepower

pump motor. Dual pulleys and vee belts couple the two. The pump consists of a hydraulic enclosure which bolts to the

larger diameter pumping head. The stroking of three pistons within the hydraulic end is hydraulically applied to one side of

an associated buna-N diaphragm, displacing water on the opposite side of the diaphragm within the pumping head. The

upper port on the pumping head is the 3/4-inch inside diameter discharge port. The lower port is the 1-inch inside

diameter pump inlet.

k. High Pressure Pump Motor and Drive Belts. The three-horsepower, 60-cycle, three phase, 240 Vac pump motor

operates continuously when the POWER SWITCH is ON (up). The motor and pump are resiliently mounted in the left end

of the watermaker behind the louvered panel and belt guard. Power to the motor comes from the magnetic starter relay

(5, FIGURE 1-4, Sheet 1). Vee belts drive the pump through 3-to-1 speed reducing pulleys. Slotted holes in the pump

base allow adjustment of belt tension.

l. Low Pressure Gauge. The low pressure gauge (1, FIGURE 1-6, Sheet 1) is mounted on the dash panel to the

right of the product water flowmeter. The gauge senses pressure at the outlet of the micron filters. Scale readings are -30

psi to +15 psi (-100 kPa to +100 kPa). In normal operation, the gauge reads positive.

m. Power Switch. The main power switch (2, FIGURE 1-6, Sheet 1) energizes the two pump motors and energizes

the switch contacts on the water monitor POWER switch. The high pressure pump motor circuit energizes the elapsed

time meter.

n. Water Monitor Assembly. The water quality monitor is the upper right electronic enclosure (3, FIGURE 1-6, Sheet

1).The monitor panel shows cumulative hours running time plus red and green lamps to indicate water quality. Also on the

panel are a fuseholder, a power switch, and an alarm switch. The water quality monitor contains the circuit logic which

automatically saves only the potable water. This circuitry converts the conductivity input from the salinity probe into a save

or dump signal to the solenoid diversion valve.

o. Brine Flowmeter Assembly. The brine flowmeter (4, FIGURE 1-6, Sheet 1) is similar in appearance and function

to the product water flowmeter. This meter intercepts brine outflow from the RO modules before it enters the brine

manifold. The bring flowmeter reads 0 to 5 gallons per minute (gpm). Normal flow is 3.5 gpm.

p. EMERGENCY PROCDURE Label Plate. The EMERGENCY PROCEDURE label plate (5, FIGURE 1-6, Sheet 2)

on the left front louvered panel gives summary procedures for starting, operating, and securing the unit.

q. HI PRESSURE GAGE PG Label Plate. The HI PRESSURE GAGE PG2 label (6, FIGURE 1-6, Sheet 2) is located

as shown,

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