47/48 Piston Actuator_Meisonilan Valves (Suzhou) Co., Ltd.

The 47/48 piston actuator is a spring-return, adjustable zero-proportion pneumatic piston linear actuator. It features high output force, a simple, reliable, lightweight and compact structure, fast operation speed, and good anti-vibration performance. This pneumatic piston actuator can be combined with linear travel control valves such as straight-through single/double-seated, angle, sleeve, diaphragm, and compact types, and equipped with a positioner to form a pneumatic piston control valve. Different spring ranges can be selected to achieve the required allowable pressure differential.

Technical Parameter

Model Project		47/48-1P	47/48-2P	47/48-3P	47/48-4P	47/48-5P	47/48-6P
Cylinder diameter mm		100	125	160	200	250	320
Travel distance mm		10	10/16	16/25	25/40	40/60	60
Spring range KPa		40-200；80-240；100-200；200-350；350-500
Gas supply pressure MPa		ZSA and ZSN are 0.4-0.6; ZS-P: The air opening ratio is 0.05 larger than the upper limit of the spring range. Gas shut-off: upper limit+lower limit+0.05
47/48-P push rod output N	350-500KPa	2674	4165	6860	10740	16800	27440
	200-350KPa	1528	2300	3920	6140	9600	15680
	100-200KPa	764	1190	1960	3070	4800	7840
	80-240Kpa	610	952	1568	2450	3840	6270
Equipped with a side mounted hand-operated mechanism		ZPXS-2		ZPXS-3	ZPXS-4	ZPXS-5	ZPXS-6

Note:

1. The thrust calculation is based on the starting spring force of the reaction force; The spring range is in the range of 350-500KPa, and the valve with valve closing adopts a smaller spring range.
2. The diameter of ZS and ZSN type cylinders is the same as that of ZS-P type.
3. Short range travel for ZS and ZSN models

Performance Metrics

ZSA/B-P type

Project	Without locator	Equipped with locator
Basic error %	±6	±1.5
Return difference %	3	1.5
Dead zone %	1.2	1
Always biased towards %	2.5
Air tightness	Input 0.6MPa into the cylinder, with a pressure drop of ≤ 5KPa/5min after cutting off the gas source
Working life	No less than 100000 times

Note: When paired with a regulating valve assembly, a valve positioner is generally included.

ZS and ZSN types

Project	When performing two actions	Cylinder sealing performance	Working life
47/48(ZSN)-1	1.2(≤1)	The pressure drop after cutting off the gas source with a 0.6MPa input cylinder is ≤ 5KPa/min	No less than 100000 times
47/48ZS(ZSN)-2	1.2(≤1)
47/48(ZSN)-3	≤2(≤1)
47/48(ZSN)-4	≤2.5(1)
47/48(ZSN)-5	≤3.5(1.5)
47/48(ZSN)-6	≤4.5(2)

Part Material

Part name	Material	Part name	Material
Cylinder	Fine drawn aluminum alloy tube, hard anodized	Piston	LY12
Compression spring	60Si2MnA	Push rod	2Cr13
QY type sealing ring	TPU、EPDM	Bracket	HT250

Connection size

Model size	47/48-1P	47/48-2P	47/48-3P	47/48-4P	47/48-5P	47/48-6P
	ZS-1	ZS-2	ZS-3	ZS-4	ZS-5	ZS-6
	ZSN-1	ZSN-2	ZSN-3	ZSN-4	ZSN-5	ZSN-6
A	125×125	148×148	185×185	232×232	283×283	283×283
H	250	290	325	440	590	640
	250	290	325	440	590	640
	200	245	272	352	431	510
L	90	97	110	150	170	295
L1	60	81	92	115	110	200
D1	/	80	80	105	122	130
D2	32	60	60	80	95	100
n-φd	/	2-Φ10	2-Φ10	4 -Φ12	4 -Φ14	4 -Φ18

Valve Installation:
(1) Before installation, check that the product model, tag number, and specifications match the requirements. Inspect the entire valve for missing or loose parts.
(2) Prior to installation, clean the pipeline. Ensure there is sufficient straight pipe section at the valve inlet and install a filter. When connecting the valve body to the pipeline flanges, ensure coaxiality.
(3) Thoroughly clean the pipeline before installing the valve.
(4) The installation site should ensure the safety of personnel and equipment, facilitating operation, disassembly, and maintenance.
(5) The valve should be installed vertically upright on horizontal pipelines. If necessary, it can be installed at an angle, but horizontal installation should be avoided. For occasions with heavy valve weight or vibration, use a support frame.
(6) The medium flow direction must align with the arrow on the valve body. The air supply should be dry and oil-free. The valve should be used in environments with temperatures ranging from -20℃ to 55℃.

Valve Maintenance:
(1) Cleaning the Valve: For general media, cleaning with water is sufficient. For media harmful to health, first understand their properties and then select an appropriate cleaning method.
(2) Disassembly: Remove rust from exposed rusted parts first. Before derusting, protect the machined surfaces of precision parts such as the valve seat, valve plug, valve stem, and push rod. Use special tools when disassembling the valve seat.
(3) Valve Seat: Minor rust or wear on the sealing surface can be repaired by machining. If damage is severe, replace the seat. However, both repaired and replaced hard sealing surfaces must be lapped.
(4) Valve Stem: If the surface is damaged, it must be replaced.
(5) Damage to Push Rod, Guide, and Sealing Surfaces: Reverse-acting actuators must be replaced; direct-acting actuators can be reused after proper repair.
(6) Compression Spring: If there are cracks or other defects affecting strength, replace it immediately.
(7) Wear Parts: Packing, gaskets, and O-rings must be replaced entirely during each maintenance. Check the valve plug and diaphragm for cracks, aging, or corrosion that may cause future failures. Decide whether to replace them based on inspection results, but the diaphragm service life should not exceed 2-3 years.
(8) When reassembling the valve, ensure alignment. Tighten bolts diagonally and lubricate sliding parts. After reassembly, debug the valve according to the factory test items and methods. During this period, accurately adjust the packing compression force and the valve plug closing position.

When placing an order, please fill in the Specification Sheet or specify the following information:

If the model has not been selected before ordering, please provide us with the operating parameters:
(1) Nominal diameter DN (mm);
(2) Nominal pressure (MPa or bar);
(3) Fluid properties (including medium temperature, viscosity, or acidity/alkalinity);
(4) Pressure before and after the valve (pressure differential);
(5) Requirements for flow characteristics;
(6) Materials of valve body and valve core;
(7) Connection type;
(8) Driving method (provide air supply pressure, driving voltage);
(9) Supporting accessories (for pneumatic valves, it is recommended that users install an air filter triplet and a 2-position 5-way solenoid valve);
(10) On-site working conditions.
If the product model of our company has been selected by the design unit, please order directly from our production department according to the model;
When the application occasion is very important or the pipeline is relatively complex, please provide the design drawings and detailed parameters as much as possible, and our experts will review and check them for you.