Alco N Series High-Pressure Needle Valve, 1/2" Female NPT, 6000 psi, SS316, N4NS

HOKE (Crane Instrumentation & Sampling) 2219F8Y

2219 Series Severe Service Needle Valves — Forged Body, Union Bonnet

Hoke 2219F8Y — 2219 Series severe-service needle valve, 1/2 in female NPT, 316 stainless steel forged body with union bonnet, 6,000 psig at 70°F (414 bar at 21°C), 0.312 in (7.9 mm) orifice, Cv 1.20, Grafoil packing, non-rotating 316 stainless steel stem tip. Listed here as a cross-reference, not as an identical part. The Alco N4NS offered on this page matches it on connection size, body material and 6,000 psi rating at the same 38°C reference temperature, but it is the smaller-bore valve — 5 mm orifice and Cv 0.7 against 7.9 mm and Cv 1.20, roughly 40 per cent less flow. Packing is RTFE rather than Grafoil, which sets the continuous service ceiling at 230°C against the Hoke valve's 538°C at reduced pressure, and the stem tip is hardened 17-4PH rather than 316 stainless steel.

Parker Hannifin (Instrumentation Products Division) 8F-U12LR-T-SS

U Series Needle Valves — Union Bonnet, 6,000 PSI Maximum (Catalog 4110-NV)

Parker 8F-U12LR-T-SS - U Series union-bonnet needle valve, 1/2 in female NPT (ANSI/ASME B1.20.1), 316 stainless steel body, regulating stem, PTFE packing, 6,000 psig (414 bar) CWP, -54 to +232 C. Listed here as a cross-reference to help buyers searching that number; the valve on this page is the Alco equivalent indSpare stocks. Pressure rating, port size, thread standard, 316 stainless body, non-rotating 17-4PH stem tip, metal-to-metal seat and metal-to-metal body-to-bonnet seal all correspond. Flow capacity does not: the Parker part has a 0.312 in (7.9 mm) orifice and Cv 1.19, against a 5 mm orifice and Cv 0.7 on this valve - roughly 70 per cent more flow at the same opening. Parker's smallest 1/2 in female NPT needle valve is 7.9 mm, so this difference comes with the size rather than with the particular model; check flow and orifice before substituting. The Parker valve is also supplied with an aluminium T-bar handle as standard; this valve has a stainless steel T-bar handle.