Bellows Globe Valve_Meisonilan Valves (Suzhou) Co., Ltd.

This valve is suitable for working conditions involving flammable, explosive, highly toxic, toxic fluids, high-temperature heat transfer oil, liquid ammonia, and other media, effectively preventing external leakage of the valve. It is widely used in pipelines of various working conditions such as ethylene glycol, petrochemical, chemical fiber and textile, plastic and papermaking, electric power and steel, printing and dyeing and rubber, and natural gas, serving as an opening and closing device for controlling medium cut-off.

Product Features

1. Reasonable product structure and reliable sealing.

2. The sealing surface is welded with Co based hard alloy, which has good wear resistance, corrosion resistance, friction resistance, and long service life.

3. Valve stem quenching and surface nitriding treatment, with good corrosion and friction resistance performance.

4. The material of the parts and the dimensions of the flanges and welding ends can be reasonably selected according to actual working conditions or user requirements to meet various engineering needs.

5. The valve core can be made into cut-off type and adjustable type according to needs.

Product Model

Material	National standard model
WCB	WJ41H-16C,WJ41H-25,WJ41H-40
304SS	WJ41H-16P,WJ41H-25P,WJ41H-40P
316SS	WJ41H-16R,WJ41H-25R,WJ41H-40R

Product Performance Specification

Model		WJ41H-16C	WJ41H-25C	WJ41H-16P	WJ41H-25P	WJ41H-16R	WJ41H-25R
Work pressure (MPa)		1.6	2.5	1.6	2.5	1.6	2.5
Applicable temperature (℃)		≤425		≤200
Applicable Medium		Non corrosive medium		Corrosive media
Material	Valve body, valve cover, gate plate	Carbon steel		CF8
	Valve stem	Chromium stainless steel		CF8		CF3
	Sealing surface	Chromium stainless steel or carbon steel overlay hard alloy		Chromium stainless steel or carbon steel overlay hard alloy
	Filler	Flexible graphite or stainless steel wire clamped flexible graphite		Flexible graphite or stainless steel wire clamped flexible graphite
	Corrugated tube	304SS		304SS		316SS

Appearance parameters and connection dimensions

Nominal diameter DN	Main external dimensions and connection dimensions
Nominal diameter DN	L	D	D1	D2	b	H	Do
WJ41H-16C WJ41H-16P
15	130	95	65	47	14	202	120
20	150	105	75	58	14	231	140
25	160	115	85	68	14	231	140
32	180	140	100	78	16	286	160
40	200	150	110	88	16	317	200
50	230	165	125	102	16	317	200
65	290	185	145	122	18	331	240
80	310	200	160	123	20	402	240
100	350	220	180	158	20	416	320
125	400	250	210	184	22	467	360
150	480	285	240	212	24	525	360
200	600	340	295	268	26	611	500

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.