Alco N Series High-Pressure Needle Valve, 1/2" Female NPT, 3000 psi, SS316, N4NS-3K

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-3K offered on this page is rated 3,000 psi at 38°C, half the Hoke valve's rating, and 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, and the stem tip is hardened 17-4PH rather than 316 stainless steel. Check pressure rating, flow capacity and service temperature against your duty before substituting.

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. Please read two differences before substituting. Pressure: the Parker part is rated 6,000 psi, while this valve is the 3,000 psi build - it must not be used in a 6,000 psi service. For a like-for-like 6,000 psi equivalent see the Alco N4NS. Flow: the Parker part has a 0.312 in (7.9 mm) orifice and Cv 1.19, against a 5 mm orifice and published Cv 0.7 on the Alco N Series 1/2 in 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. Port size, 316 stainless body, non-rotating 17-4PH stem tip, metal-to-metal seat and metal-to-metal body-to-bonnet seal correspond on both. The Parker valve is supplied with an aluminium T-bar handle as standard; this valve has a stainless steel T-bar handle.