Fushiman RK26A type check valve

Manufacturer: Fushiman Co.,LTD.
Model: RK26A

Model	Nominal diameter	Fluid	Maximum Operating Pressure	Maximum Operating Temperature	Body Material	Connection
RK26A	15–100	Steam Gas Liquid	4.22 MPa	300°C	Austenitic stainless steel (equivalent to SUS316)	Wafer

Wafer type, compact, and lightweight — installation orientation is optional.
We also manufacture valve bodies in stainless cast steel (RK16A type). (Note: Cv values and pressure loss may differ slightly.)

Specifications

Model		RK26A
Description		The maximum operating pressure and temperature for metal seat valves vary depending on the flange standard. Valves for use above 300°C are also available.
Type of Disc Contact Surface		Metal Seat			Soft Seat
Applicable Fluid		Liquid, gas, and steam			Water, condensate, and steam	Mineral oil	Gas and air
Maximum Operating Pressure (MPa)		4.22	3.57	3.16	4	4	4	5.7
Maximum Operating Temperature (°C)		100	200	300	120	120	120	160
Material	Disc	Stainless Steel			EPDM	Fluororubber
	Body & Seat (Integral)	Austenitic Stainless Cast Steel
	Spring	Stainless Steel
Pipe Connection: Compatible Flanges		Wafer Type: DIN PN 10/16/25/40, ASME Class 150/300 RF

Structure and Dimensions

Model				RK26A
Nominal Diameter				15	20	25	32	40	50	65	80	100
Dimensions	L			25	31.5	35.5	40	45	56	63	71	80
	D	ASME Class 150 RF		46	56	66	75	85	104	123	135	173
		ASME Class 300 RF		52	63	72	81	93	108	128	147	179
		DIN PN 10–40		52	63	72	81	93	108	128	143	PN 10/16：163 PN 25/40：169
Opening Pressure	Installation Orientation	Without Spring	↑	0.25	0.25	0.25	0.35	0.40	0.45	0.50	0.55	0.65
		With Spring	↑	1.00	1.00	1.00	1.20	1.30	1.40	1.50	1.60	1.80
			→	0.75	0.75	0.75	0.85	0.90	0.95	1.00	1.05	1.15
			↓	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50
Cv Value				4.3	7.9	12	18	27	43	68	90	135
Weight				0.25	0.40	0.57	0.83	1.20	2.15	3.20	4.50	6.90

Note: The allowable tolerance for opening pressure is ±20%. Do not use for pressure regulation purposes. RK26A

Note (1):
In partial opening conditions (when pressure loss ΔP is 2 kPa or less), chattering may occur. Do not use under such conditions.

The lines in the graph show water at 20°C.
To determine pressure loss for other fluids, use the following formula to calculate the equivalent water flow rate, then read from the graph:
Vw = V × ρ / 1000
Vw: Equivalent water flow rate (ℓ/s or m³/h)
ρ: Fluid density (operating) (kg/m³)
V: Actual flow rate (operating) (ℓ/s or m³/h)
The graph assumes horizontal piping unless otherwise noted.
In vertical piping, the valve may behave differently until it is fully open, but once fully open (normal flow), it functions the same as in horizontal piping.