Linear Inductive Valve Position Transmitter
The X156 Linear Inductive Valve Position Transmitter electronically indicates the position of the valve and is ideal for applications where precision and accuracy is required. It is mounted directly to the main valve stem and uses an external source of 24VDC power, a 4 to 20mA signal proportional to valve stroke is generated and transmitted. The zero and span are fully adjustable over the complete range of stroke.
Select Singer main valve specifications from the main valve section and incorporate the following addendum:
Oxy-Nitride Stem
The Oxy-Nitride stem is ideally suited to reclaimed water applications and a wide range of other applications where mineral-build up is a concern.
When minerals build-up on stems, it can cause potential maintenance problems and operational malfunctions. The Oxy-Nitride treated stainless steel stem is the perfect solution. Its specialized proprietary aerated salt bath treatment will reduce or prevent mineral build-up allowing the stem to stroke freely as it passes through the guide bushing. The Oxy-Nitride stem also increases surface hardness as well as wear, fatigue, lubricity and corrosion resistance.
Select Singer main valve specifications from the main valve section and incorporate the following addendum:
Position Indicator
The X107 position indicator stem is designed to provide direct indication of the diaphragm / inner valve position. The indicator stem moves up and down within its protective hexagonal brass housing. Within the housing is clear Pyrex sight glass, which allows viewing from both sides.
Singer main control valves are designed with a separate stem cap that makes installation of the X107 safe and simple to do in the field.
Select Singer main valve specifications from the main valve section and incorporate the following addendum:
Deep Well Pump Control Valve – Double Chamber
The 106-DW and 206-DW deep well pump control valves are installed in a tee between the pump discharge and the check valve.
The valve is normally open, and, on pump start-up, a pilot solenoid is energized to start closing the valve at a rate governed by the closing speed control.
Initially, the valve discharges air, water and sand to waste. The open valve discharges all pump flow. As the valve closes slowly, flow is transferred to the main line smoothly, increasing the pipeline flow without surges. When the valve is fully closed, all pump flow is in the pipeline, with no control valve losses.
When shut-down is required, the pilot solenoid on the valve is de-energized to commence opening. The pump is kept running while the valve slowly opens. Increasing proportion of the flow is diverted to waste with less passing through the check valve, until all flow is diverted through the nearly fully open DW valve. The pipeline check valve closes quietly without surges. When the DW valve is almost fully open, a stem mounted cam triggers the limit switch to stop the pump.
Specifications
Booster Pump Contol Valve – Single Chamber
The 106-PG-BPC or 206-PG-BPC booster pump control valve is installed in-line directly downstream of the pump discharge.
The valve is normally closed, and, on pump start-up, a pilot solenoid is energized to slowly open the valve, at a rate governed by the opening speed control. The pipeline flow is gradually increased.
When shut-down is required, the pilot solenoid is de-energized to close the main valve and reduce the flow. The pump is kept running while the booster pump control valve slowly closes. When the valve is almost fully closed and flow is virtually stopped, a cam triggers the limit switch to stop the pump.
With the internal drop check option, the built-in mechanical drop check closes immediately when the flow stops, regardless of the valve position. Whether due to a control malfunction, normal operation or a pump motor power failure, by closing before flow reverses, surges are minimized.
The single chamber construction facilitates supplemental modulating functions such as pressure sustaining, pressure reducing, rate of flow control. Being a single chamber design, the control forces are generated by the differential across the valve. When a modulating function is included there are more positive initial closing results.
Specifications
Excess Flow (Burst Control) Valve
The 106-EF-8837BX and 206-EF-8837BX excess flow valves are based on the 106-PT and 206-PT Double Chamber main valves. The valve is designed to shut-off tightly when flow exceeds a predetermined amount.
The 625-RPD pilot senses the pressure drop of the valve and closes the valve when the tripping flow is reached. Typical pressure drop at tripping is 5 psi / 0.35 bar.
Tripping flow is adjusted by limiting the valve opening with the X102 Stroke Limiter. 10 psi / 0.7 bar inlet pressure must be maintained at the valve inlet when the valve has tripped to prevent self re-setting. This valve closes fast and from a significant velocity. If the upstream pipe is longer than 2,000 ft /600 m, closing speed control should be included. When tripped (closed), this valve has a continuous exhaust of about 1 GPM / 0.063 L/sec to drain.
Specifications
Rate of Flow Valve
The 106-RF and 206-RF rate of flow control valves are based on the 106-PG or 206-PG main valves.
The valve is ideal for limiting the flow to a pre-determined maximum (via maintaining a continuous pressure differential across an orifice). When the pressure differential is less than the set-point, the valve opens, allowing flow to meet predetermined demand. At the desired maximum set-point, the pilot reacts to small changes in sensing pressure and controls the main valve position by modulating the pressure above the diaphragm.
When the pressure drop across the orifice exceeds the set-point, the valve closes slightly, limiting the flow to the pre-set maximum. The orifice is usually sized to generate a pressure differential of 3 to 5 psi / 0.2 to 0.35 bar at the desired flow. Adjusting the pilot setting permits the maximum flow to be changed in the field above or below the original point.
Specifications
Anti-Cavitation Control Valve
The 106-AC series control valve is designed to solve high pressure drop problems by allowing smooth control and protection from cavitation damage. It’s ideal for applications where large pressure differentials preclude the use of standard automatic control valves and varying flows make orifice plates ineffective.
The AC control valve contains two heavy stainless steel sliding cages that maximize the full flow capacity. The first cage directs and contains the cavitation recovery, allowing it to dissipate harmlessly. While the second cage allows further control to a level as low as atmospheric pressure downstream. The cages are engineered to meet the flow / pressure differential of each application.
CAUTION: Valve sizes, dimensions and selection criteria shall be referenced only from the Anti-Cavitation section on pages 86. The following addendum shall be added to the 106-PG in the Main Valve section, page 11, for a detailed Anti-Cavitation specification:
Addendum to 106 PG:
Booster Pump Control Valve – Double Chamber
The 106-BPC and 206-BPC booster pump control valves are installed in-line, directly downstream of the pump discharge.
The pump control valve is normally closed and on pump start-up, a pilot solenoid is energized to open the valve, at a rate governed by the opening speed control. When shut-down is required the pilot solenoid on the valve is de-energized to commence closing. The pump is kept running while the valve slowly closes. When the valve is almost fully closed and flow is virtually zero, a stem mounted cam triggers the limit switch to stop the pump.
In the event of a power failure, the built-in mechanical drop check closes immediately when the flow stops, independently of the valve position. Surges are minimized by closing the valve before reverse flow occurs.
Specifications
Altitude Pilot Valve
An altitude pilot valve that is spring and diaphragm operated; it controls the water level in a reservoir by sensing the hydrostatic head. When the hydrostatic head equals the spring force, the pilot connects port “X” (connection to main valve inlet ) to port “K” (connection to main valve bonnet). The main valve closes. When the hydrostatic pressure decreases slightly, the port “X to K” connection is closed by the inner valve. When the hydrostatic pressure is reduced even further, the pilot connects port “K” (main valve bonnet) to “EX” (exhaust to atmosphere). Then the main valve opens.
Model 301-4 pilot is used as the standard pilot on all 106 and 206 series altitude valves.
