MD Series Cage-Type Regulating Valve sturdy valve cage guiding mechanism ensures that the valve core remains stable throughout its movement, with small amplitude vibration and low operating noise. The seat ring with sealing surface provides superior open & close performance and high-precision flow characteristic curves.It features quick-replaceable valve trims, easy-to-maintain packing, and simplified full-valve repairs. According to different working conditions, single-stage or multi-stage sleeve valve teimls can be selected. It is primarily used in general and harsh environments involving high&low-temperature media. Additionally, it achieves tight shut-off and is well-suited for clean fluids and gases under high differential pressure conditions.

Main Technical Specifications

Flow characteristic	Equal percentage/linear/quick-opening
Inherent adjustable ratio	50 : 1
Leakage class	Conform to ANSI/FCI & IEC60534-4 IV(standard); V, VI(optional)
Service temp.	-196~649ºC
Intrinsic error	±1%
Backlash	±1%
Dead zone	0.8%
Connection standard	Flange connection: ASME B16.5 Threaded/socket weld connection: ASME B16.11 Butt weld connection: ASME B16.25
Optional internals	Multi-stage pressure/noise reduction guide cage

Valve Material

No.	Component	Material	Temperature range
1	Valve body	WCB/WC6, WC9/CF8, CF3M	-196~593ºC (Depend on the material's temperature limits)
2	Seat sealing ring	316 stainless steel + graphite	-196~593ºC
3	Valve cage	304/17 - 4PH/CA6NM	same as valve service temp.
4	Valve core form	see the table below for details
5	Bonnet sealing ring	316 stainless steel + graphite	same as valve service temp.
6	Packing	PTFE V-ring	-40~232ºC(other medium)
		PTFE + composite material	-73~232ºC(oxydic medium)
		soft graphite	-196~538ºC(other medium)
		soft graphite	-196~371ºC(oxydic medium)
		soft graphite(high O2 dennsity)	-196~593ºC
7	Valve stem	304/17 - 4PH/38CrMoAlA	same as valve service temp.
8	Packing bushing	304 stainless steel	-196~593ºC

Valve core form	Material	Leakage class
Standard	304/410stainless steel	IV class
Pilot spool	Inconel718/304 spring	V class
C-ring	Inconel718/304 C-ring	IV class

Product Illustration

Bonnet structure diagram
Bonnet form	standard	high temperture	low temperture
Service temp.	-29~425ºC	-29~593ºC	-196~150ºC
Suitable medium	steam, water, air		LNG, air separation operating condition
Material	WCB	WC6/WC9	CF8/CF3M

Standard valve trims

Standard window guide cage

Multi-stage noise reduction guide cage

Rated Flow Coefficient

Nominal Dia. Inch	Valve seat inner Dia. DN	Max stroke mm	Quick-opening		Linear		Equal percentage
Nominal Dia. Inch	Valve seat inner Dia. DN	Max stroke mm	Cv	Kv	Cv	Kv	Cv	Kv
1-1/2	25	19	29.9	25.9	29.2	25.3	23.1	20
1-1/2	40		44	38.1	39.2	33.9	35.8	31
2	25		31.2	27	33.3	28.8	24.3	21
	40		59.1	51.1	56.4	48.8	54.4	47.1
	50	29	77.6	67.1	72.9	63.1	59.7	51.6
2-1/2	65	38	121	104.7	114.7	99.2	108.1	93.5
3	50	29	91.9	79.5	102	88.2	70.7	61.2
3	80	38	161	139.3	148	128	136	117.6
4	65	38	130	112.5	113	97.7	112	96.9
	80	38	191	165.2	182	157.4	158	136.7
	100	51	251	217.1	236	204.1	224	193.8
6	100		358	309.7	322	278.5	274	237
6	150		460	397.9	433	374.5	394	340.8
8	100		368	318.3	353	305.3	313	270.7
	150		637	551	620	536.3	515	445.5
	200		754	652.2	657	568.3	567	490.5
	200	76	974	842.5	873	755.1	743.4	643
10	250	100	-		1188.8	1028.3	995.5	861.1
12	300				1588.4	1374	1433.5	1240
14	310				2027	1753.4	1719	1486.9
16	374.7				2601	2249.9	2099	1815.6
20	500				-		2500	2162.5

Product Dimensions (mm)

RA: Reverse action
PA: Positive action
St: Standard
Ex: Extended

DN	Actuator	Ф A	H				Height H1			Height H2		Height H3		Length L
			RA		PA		150 LB	300 LB	600 LB	RA	PA	RA	PA	150 LB	300 LB	600 LB
			St	Ex	St	Ex	150 LB	300 LB	600 LB	RA	PA	RA	PA	150 LB	300 LB	600 LB
40	30	289	564	650	602	688	71.5	78	78	440	478	164	206	222	235	251
40	34	333	622	708	697	783	71.5	78	78	498	576	204	229	222	235	251
50	40	333	713	813	759	861	78	82.5	82.5	548	595	204	229	254	267	286
50	45	406	824	926	933	1035	78	82.5	82.5	658	769	260	300	254	267	286
65	45	406	845	946	956	1056	89	95.5	95.5	658	769	260	300	276	292	311
80	45	406	850	951	959	1060	97	105	105	658	769	260	300	298	317	337
100	45	406	880	981	989	1090	131	127	136.5	658	769	260	300	352	368	394
150	60	473	973	1078	1035	1141	139.5	159	178	721	784	260	300	451	473	508
150	70	536	1091	1183	1184	1290	139.5	159	178	840	933	313	388	451	473	508
200	70	536	1231	1253	1461	1345	184	190.5	209.5	840	933	313	388	543	568	610
250	70	536	1531	1553	1761	1745	202.5	222.5	255	840	933	313	388	676	708	752
300	70	536	1331	1551	1424	1644	242.5	260	280	840	933	313	388	737	775	819
DN	Actuator	Ф A	St		Ex		150/300LB		600LB					Length L
DN	Actuator	Ф A	150/ 300LB	600LB	150/ 300LB	600LB	150/300LB		600LB					Length L
350	ZS45SA/BN	540	2204.5	2220.5	2454.5	2470.5	354		370					889	927	972
	ZS45SA/BS		2554.5	2570.5	2800.5	2816.5
	ZS45WN		1838.5	1854.5	2084.5	2100.5
	ZS45WS		2188.5	2204.5	2434.5	2450.5
400	ZS45SA/BN	540	2315	2328	2553	2566	403		416					1016	1057	1108
	ZS45SA/BS	540	2665	2678	2903	2916
	ZS50SBN	610	2357	2370	2595	2608
	ZS50SBS	610	2707	2720	2945	2958
	ZS45WN	540	1949	1962	2187	2200
	ZS45WS	540	2299	2312	2537	2550

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