Diaphragm Valve — Caustics/Bases
Named chemicals
What LibertyCES's vendor documentation shows
The isolation-valve half of the lime slurry story the pump-only cell leaves open: the Type-14's weir design is specifically stated to seal bubble-tight even with slurries and suspended particles, which is the requirement in a lime feed line where a ball valve's seat pocket packs with hardened Ca(OH)2. Moderate because no vendor names lime slurry for a diaphragm valve directly — the caustics pairing data is real and concentration-specific, the lime application is corpus-level inference. Netafim's ALD70 caustic ratings are the only concentration-AND-temperature-resolved caustic diaphragm data in the corpus and show a genuinely non-monotonic pattern.
Materials documented for this service
- EPDM diaphragm (Asahi's stated pairing for NaOH 50% and aqueous ammonia 19%)
- 3-layer EPDM/PVDF/PTFE diaphragm
- PVC and PP body per ASTM D1784 CC 12454-A and D4101 CC PP0210B67272
- Netafim ALD70 on caustic soda: Limit 15-50% @70°C, Limit 70% @38°C, Good 5% @50°C, Good 50% @100°C, Good 70% @50°C and @100°C
Products cited for this service
Every material and product claim on this page traces to real, vendor-published documentation on file with LibertyCES. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.
FAQ
Is Diaphragm Valve compatible with Caustics/Bases?
The isolation-valve half of the lime slurry story the pump-only cell leaves open: the Type-14's weir design is specifically stated to seal bubble-tight even with slurries and suspended particles, which is the requirement in a lime feed line where a ball valve's seat pocket packs with hardened Ca(OH)2. Moderate because no vendor names lime slurry for a diaphragm valve directly — the caustics pairing data is real and concentration-specific, the lime application is corpus-level inference. Netafim's ALD70 caustic ratings are the only concentration-AND-temperature-resolved caustic diaphragm data in the corpus and show a genuinely non-monotonic pattern. This is moderate evidence.
What materials are documented for Diaphragm Valve in Caustics/Bases service?
Materials documented for this service: EPDM diaphragm (Asahi's stated pairing for NaOH 50% and aqueous ammonia 19%), 3-layer EPDM/PVDF/PTFE diaphragm, PVC and PP body per ASTM D1784 CC 12454-A and D4101 CC PP0210B67272, Netafim ALD70 on caustic soda: Limit 15-50% @70°C, Limit 70% @38°C, Good 5% @50°C, Good 50% @100°C, Good 70% @50°C and @100°C. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm with a spec review before final specification.
What specific Caustics/Bases chemicals does this cover?
Named chemicals in this documentation: lime slurry / calcium hydroxide (Ca(OH)2), sodium hydroxide 50%, caustic soda 70%, aqueous ammonia 19%.
What products are cited for Diaphragm Valve in Caustics/Bases service?
Documented examples include Asahi/America Type-14 Flanged Diaphragm Valve (weir design; bubble-tight sealing even with slurries and suspended particles; built-in travel stop prevents diaphragm overtightening; bayonet compressor-to-diaphragm connection), Asahi/America Type-14 True Union Diaphragm Valve (PVC/EPDM pairing for 50% NaOH and 19% aqueous ammonia per the Advanced PE chart).