A summary of the Bill of Materials (BOM) and material specifications for the NIDEC diaphragm pump head is provided below. It primarily covers four core functional areas: structural support, fluid control, sealing, and power transmission.

Parts in contact with the conveyed medium, corresponding to item numbers: 1 Valve Cover, 2 Gasket, 3 Valve Seat, 4 Umbrella Valve, 5 Diaphragm.

Parts NOT in contact with the conveyed medium, corresponding to item numbers: 6 Diaphragm Fixing Plate, 7 Motor Mount, 8 Fixing Plate, 9 Shaft, 10 Bushing, 11 Screw, 12 Self-tapping Screw.


1. Core Structural Components (Heat Resistance & Strength)

  • Material:​ SPS C132 (1 Valve Cover, 3 Valve Seat, 7 Motor Mount)
  • Characteristics:​ SPS (modified Polyphenylene Sulfide) offers excellent high-temperature resistance and mechanical strength. UL 94HB is the basic flammability rating.
  • Function:​ Serves as the primary structural skeleton of the pump body, ensuring stability in high-temperature liquid environments.

2. Fluid Control Components (Rubber Elastomers)

  • Material:​ EPDM (Ethylene Propylene Diene Monomer) (4 Umbrella Valve, 5 Diaphragm, 2 Silencer Gasket)
  • Characteristics:​ Excellent resistance to aging, water, and weak acids/alkalis, with outstanding elasticity.
  • Function:​ Responsible for the opening and closing of the check valve (Umbrella Valve) and the suction/discharge of liquid (Diaphragm), utilizing the rubber's elasticity to achieve sealing.

3. Precision Transmission Components (Wear-Resistant & Self-Lubricating)

  • Material:​ POM NW-02 (Polyoxymethylene) (6 Diaphragm Fixing Plate, 8 Fixing Plate, 10 Bushing)
  • Characteristics:​ Features high rigidity, a low friction coefficient, and excellent wear resistance, making it maintenance-free.
  • Function:​ Acts as internal sliding bearings and support brackets, ensuring the precision and smoothness of the motor shaft's reciprocating motion.

4. Metal Component (Core Transmission Shaft)

  • Material:​ SUS303 (Stainless Steel) (9 Shaft)
  • Characteristics:​ Easy to machine and offers good corrosion resistance.
  • Function:​ Connects the motor to the diaphragm, converting the motor's rotational motion into the diaphragm's linear reciprocating motion. It is the power transmission core of the entire pump.

5. Fasteners

  • Material:​ SWCH (Carbon Steel) (11 Screw, 12 Self-tapping Screw)
  • Function:​ Used for the mechanical fastening and assembly of various components.

Summary:

The pump head design employs a classic combination of engineering plastics: "SPS (for the structural framework) + POM (for transmission components) + EPDM (for fluid handling/sealing)". This is complemented by a corrosion-resistant stainless steel shaft and carbon steel screws. This material combination ensures high-temperature and corrosion resistance while achieving very low operating noise and long-term, maintenance-free operation.