Metering Pump Accessories
Various accessories are available to enhance pump performance.
- Relief Valves
Prevents the pump and piping from damages by releasing excessive pressure in the piping.
Diaphragm pumps always discharge the suctioned liquid. Therefore, if the discharge-side piping is blocked, while the pump is operating, the pressure will continue to increase until something breaks.
A relief valve automatically releases excessive pressure that occurs in the discharge-side piping due to issues such as clogged foreign matter and valve closures. In this way, relief valves prevent accidents such as pump and piping damage.
- Back Pressure Valves
Prevents overfeeding and siphoning phenomenon.
The overfeeding phenomenon and the siphoning phenomenon are prevented by sealing the piping outlet with a diaphragm and applying just enough force (back pressure) to overcome the force of inertia of the liquid.
A phenomenon that occurs in flows with pulsation. With this phenomenon, liquid continues owing even when it should be stopped and is discharged at a volume larger than the rated volume due to the discharge momentum (inertia).
A phenomenon where the chemical is naturally sucked out and continues to ow even when the pump is stopped because the position of the end of the pump's discharge-side piping is lower than the level of the liquid in the suction-side tank.
- Anti-Syphon Check Valves(Injection Valve)
Prevents overfeeding and siphoning phenomenon.
Also has a check valve function.
This accessory not only prevents the overfeeding phenomenon and the siphoning phenomenon but also has a check valve function that prevents the liquid from being discharged from the main pipe.
When injecting chemicals into a boiler pipe, if the boiler stops and the temperature drops, a negative pressure (a vacuum) develops within the boiler. This causes the chemical to be suctioned even when the pump is stopped.
An anti-siphon check valve applies a back pressure slightly higher than 0.1 MPa to prevent the chemical from being suctioned.
- Air Chamber/Dumper
Reduces piping vibrations using elasticity of air.
This accessory uses the elasticity of air to attenuate the pulsation of a reciprocating pump. This makes it possible to reduce piping vibrations, the overfeeding phenomenon,
and other such problems related to pulsation.
Note that in order to use an air chamber, it is necessary to install a throttle valve for pressure adjustment.
If the amount of air within an air chamber is reduced, it loses its ability to reduce pulsations, so it is necessary to periodically refill the air chamber with air. TACMINA produces "Smooth ow pumps," which are diaphragm pumps that do not require an air chamber.
Damper (for use with the PZiG)
Prevents piping vibrations and enables long-distance transfers of chemicals.
This accessory prevents piping vibrations and is very effective during long-distance transfers of chemicals.
Furthermore, the liquid does not come into direct contact with the air, which reduces the frequency of maintenance such as air chamber refilling.
- Pulse-Emitting Flowmeter/Flow Indicator/Discharge Amount Checker
Pulse-emitting flow meter
A flow meter that does not require electric power.
Combining this accessory with a TACMINA pulse signal input metering pump creates a simple and inexpensive ow rate proportional injection system.
Flow indicator (flow sight glass)
Makes it easy to check the discharge operation.
Attaching this accessory to the discharge side of a metering pump makes it easy to check the discharge operation, which is useful in preventing injection failures.
Types that are equipped with a photoelectric sensor can automatically output an alarm when an injection failure occurs.
Discharge volume checker
Monitors the pump's injection operation.
This accessory is resistant to acids and alkalis and can be used to check the pump's injection operation at a low cost.
Two types are available: a type that is connected directly to the pump and a hose connection type.
- Pressure Gauge
Monitors the pressure inside a pipe.
- Residual Pressure Release Valve
Releases the pressure within the piping.
Installing this accessory on the discharge side of a pump makes it possible to safely release the pressure within the piping when abnormal pressure occurs.
This also makes it possible to safely discharge the residual pressure and residual liquid during maintenance.
- Degassing Connector
Prevents discharge problems caused by the gas lock phenomenon.
With sodium hypochlorite and similar materials that easily generate decomposed gas, the gas lock phenomenon occurs and makes the pump unable to discharge.
Installing a degassing joint on the pump's suction side separates the suctioned bubbles and liquid to prevent the bubbles from entering the pump head.
- Gas Lock Phenomenon
- A state in which gas enters the pump head and prevents the pump from transferring liquid.
- Strainer・Foot Valve
Prevents the intrusion of debris.
When the liquid is suctioned from the top of the tank, attach this accessory to the tip of the suction-side hose to prevent the intrusion of debris.
Prevents entry of dirt and other foreign matter.
Foot valve (strainer-equipped foot valve)
Check valve-equipped strainer.
This is the check valve-equipped strainer that is attached to the tip of the suction-side hose when the liquid is suctioned from the top of the tank.
- Float Switch・Level Measurement
Monitors the amount of chemical liquid remaining in the tank.
This accessory can be used to stop the pump and generate an alarm to indicate that the liquid needs to be refilled when the amount of chemical liquid remaining in the tank is low.
Two types are available: a float type with a selectable number of sensors (one or two), and an electrode type that has excellent chemical resistance.
- Suction Valve
Cconnects the tank and the piping.
Attach this accessory to the chemical tank outlet to easily and reliably connect the tank and the piping.
The built-in strainer also prevents the entry of debris.
- Hose/Connector Types
A wide range of materials and sizes.
Hoses made from a wide range of materials (such as PVC, PE, FEP, and PTFE) and in a wide range of sizes are available.
No hose band is required. Just tighten the hose nut to reliably connect hoses together.
Screw type and TS socket type are available.
Hose 2-way joint
Use this accessory to connect hoses to each other.
Hose 3-way joint
Use this accessory to diverge hose piping.
Use this accessory as the adapter between a hose and flange piping.
Use this accessory to prevent loads from being applied to the pump such as due to piping vibrations and piping loads.
- Pump Frame/Pump Cover
These bases are dedicated for use with pumps and reliably fix pumps in place.
Contact TACMINA separately for pump cover installations.
Protects the pump from rain and wind.
This is a pump cover made from transparent PVC.
- Parts Kit
All necessary regular replacement parts are available in a set.
Regular replacement of consumables keeps the metering pump in optimal condition, allowing for a sufficient demonstration of performance.
Having all necessary regular replacement parts available in a set is more economical than purchasing individual parts separately.
Components are less likely to be lost when part of a package, and inventory management is easy.