BSW-100 Series Electric Valve Positioners

1. Remove the locator and installation accessories.

2. Use two M5 hex socket screws to secure the “T-plate” to the valve pushrod as shown in the figure on the left.

3.档杆用其自带的两颗螺母固定于 T 型板槽内。

1. Place the positioner, along with its mounting plate, on the valve. Align the keyway on the mounting plate with the two bolt holes on the valve mounting bracket, and secure it with two M10 hex head bolts. Do not tighten the bolts yet; wait until the positioner is installed and adjusted to the proper height before tightening them.

2. Place the gearshift lever in the groove of the positioner’s feedback rod; the clearance between the gearshift lever and the bottom of the positioner must not be less than 5 mm.

3. Adjust the relative position of the mounting plate and the stop rod according to the actuator's stroke length so that the vertical distance h between the positioner's feedback shaft and the stop rod is approximately equal to half the actuator's stroke, then tighten the nut.

2. Suitable for use with 0.5–1.5 mm² cables.

Piping Connections Between Positioners and Actuators
1. When installing on a single-acting actuator, connect the actuator to the “OUT1” port and plug the “OUT2” port with a plug.
2. When installing on a double-acting actuator, connect the actuator’s two input ports to the “OUT1” and “OUT2” ports, respectively.
3. Connect the “SUP” port to the air supply.

1. Connect the signal input cable and apply a 4 mA (0%) signal. Use a flathead screwdriver to gently turn the zero adjustment screw; turning it clockwise in the direction shown in the figure increases the zero point, while turning it counterclockwise decreases it.

2. If the actuator is single-acting, turn the zero-adjustment screw clockwise until pressure builds up in pressure gauge 2 and the valve moves slightly. Then, turn the zero-adjustment screw in the opposite direction until the pressure in pressure gauge 2 returns to zero, and the valve returns to its starting position.

3. If the actuator is double-acting, turn the zero-adjustment screw clockwise until the pressure on Pressure Gauge 2 rises to the valve’s nominal pressure, then turn the zero-adjustment screw counterclockwise until the pointer on Pressure Gauge 2 points to half the valve’s nominal pressure.

For example: If the actuator's operating pressure is 4 kgf/cm², adjust it as shown in the figure on the left.

With a 20 mA (100%) signal applied, check whether the actuator is fully open:

1. If the valve is fully open, reduce the input signal to 19 mA and check whether the valve actuates. If it does not actuate, this indicates that the stroke is too long. Use a Phillips screwdriver to loosen the locking screw on the stroke bracket, then turn the stroke adjustment knob 2 to 3 turns in the “-” direction. tighten the Phillips screw, apply a 4 mA signal, and readjust the zero point. Then apply signals of 20 mA and 19 mA in sequence until the valve opens fully at a 20 mA signal and moves when the signal is reduced to 19 mA.

2. If the valve does not fully open when a 20 mA signal is applied, use a Phillips screwdriver to loosen the locking screw on the travel bracket, then turn the travel adjustment knob 2 to 3 turns in the “+” direction, tighten the locking screw, readjust the zero point, and apply the 20 mA and 19 mA signals again until the valve opens fully when the 20 mA signal is applied and the valve begins to move when the signal is reduced to 19 mA. The stroke adjustment is now complete; replace the cover.

2. Drain the air filter regulator regularly to prevent moisture from inside the regulator from entering the positioner and causing it to malfunction. To drain the regulator, simply turn the drain screw counterclockwise two turns; after draining, tighten the screw.

3. During normal use, please keep the locator's housing closed to prevent water, moisture, dust, and other contaminants from entering the locator and causing malfunctions.

2. If the blockage cannot be cleared, shut off the air supply, use a 5mm hex wrench to unscrew the constant orifice assembly, then turn on the air supply to blow out the internal air passages of the positioner. Next, shut off the air supply, apply lubricant to the threads of the constant orifice assembly, and screw it back into its original position. Be careful not to lose the O-ring when reassembling.