Parker A4AK Re-seating Relief Inlet Regulators

The A4A outlet family of regulators are compact, heavy duty, pilot operated, and have remarkable functionality. The regulator will gradually close when downstream pressure begins to rise above the setting and will gradually open when pressure begins to fall below the setting. The regulator cannot maintain set-for pressure if uncontrolled branch pipe lines feed into the main pipeline downstream of the regulator. The valve's purpose is to modulate flow of refrigerant gas or liquid to maintain constant downstream pressure as set-for, despite load fluctuations.
Part Kits

 

						20mm (3/4")		25mm (1 ")
Item No.	Description					Kit No.	Qty		Kit No.	Qty
1	Seal Cap					Only Avail. With Kit	1		Only Avail with Kit	1
2	Seal Cap Gasket					Only Avail with Kit	1		Only Avail. with Kit	1
1-2	Cap Kit, Seal					202110	1		202110	1
3	Nut, Packing					Only Avail. With Kit	1		Only Avail. with Kit	1
4	Packing, Stem					Only Avail. with Kit	1		Only Avail. with Kit	1
5	Washer, Flat					Only Avail. with Kit	1		Only Avail. With Kit	1
3-5	Packing Kit, Stem					202100	1		202100	1
6	Stem, Adjusting					Only Avail. with Kit	1		Only Avail. with Kit	1
4-6	Stem Kit, Adjusting					202120	1		202120	1
12	Plate, Spring, Upper					Only Avail with Kit	1		Only Avail. with Kit	1
13	Spring, Comp.					Only Avail. with Kit	1		Only Avail. with Kit	1
14	Plate, Spring, Lower					Only Avail. with Kit	1		Only Avail. with Kit	1
15	Follower, Diaphragm					Only Avail. with Kit	1		Only Avail. with Kit	1
3-5, 6, 12-15	Spring/ Stem Kit	Range A/V				202006	1		202006	1
		Range D				202007	1		202007	1
8	Bonnet					Only Avail. with Kit	1		Only Avail. with Kit	1
11	Screw, Hx. Hd.					Only Avail. with Kit	8		Only Avail. with Kit	8
16	Bonnet Gasket					Only Avail. With Kit	1		Only Avail. With Kit	1
1-6, 8, 11-16	Spring Kit with Bonnet		Range A/V			202008	1		202008	1
			Range D			202009	1		202009	1
12-14, 16	Spring Kit, Less Bonnet		Range A/V			202481	1		202481	1
			Range D			202482	1		202482	1
17	Diaphragm					Only Avail. with Kit	1		Only Avail. with Kit	1
19	Gasket					Only Avail. with Kit	I		Only Avail. with Kit	1
16,17, 19	Diaphragm Kit		Range A/V			200770	1		200770	1
17	Diaphragms		Range D			Only Avail. with Kit	2		Only Avail, with Kit	2
16,17, 19	Diaphragm Kit		Range D			200771	1		200771	1
16-19	VC Vacuum Cartridge					202004	1		202004	1
16-19	Pilot Seat/ Diaphragm Kit (Not A4AO)			Range A		202000	1		202000	1
				Range V		202004	1		202004	1
				Range D		202002	1		202002	1
27	Plug Pkg, 1/4" NPT					202552	5		202552	5
28	Adapter					Only Avail. With Kit	1		Only Avail. With Kit	1
29	Gasket					Only Avail. with Kit	1		Only Avail. with Kit	1
19,28, 29	Adapter Kit					200703	1		200703	1
30	Piston/Stem Assembly					Only Avail. with Kit	1		Only Avail. with Kit	1
29,30	Piston Kit					200760	1		200760	1
32	Valve Body					Not Available			Not Available
34	Spring, Comp.					Only Avail. with Kit	1		Only Avail. With Kit	1
35	Washer, Flat					Only Avail. with Kit	1		Only Avail. With Kit	1
36	Wiper, Dirt					Only Avail. with Kit	1		Only Avail. with Kit	1
37	"O" Ring					Only Avail. with Kit	1		Only Avail. with Kit	1
34-37	Spring Kit, (A4A) Closing (A4AK)					202300	1		202300	1
						202298	1		202298	1
33	Plug/Stem Assembly					Only Avail. with Kit	1		Only Avail. with Kit	1
40	Washer, Flat					Only Avail. with Kit	1		Only Avail. with Kit	1
41	Packing, Stem					Only Avail. with Kit	1		Only Avail. with Kit	1
42	Nut, Packing					Only Avail. with Kit	1		Only Avail. with Kit	1
33, 34-37, 40-42	Full Cap. Plug Kit, Modul.				A4A	202021	1		202022	1
					A4AK	202037	1		202038	1
33, 34-37, 40-42	50% Cap. Plug   Kit, Modul.				A4A	202029	1		(*)
					A4AK	202036	1		(*)
33, 34-37, 40-42	35% Cap. Plug Kit, Modul.				A4A	Not Available			Not Available
					A4AK	Not Available			Not Available
33, 34-37, 40-42	17% Cap. Plug Kit, Modul.				(A4A)	202030	1		(*)
					(A4AK)	202030	1		(*)

 

 

	32mm (1-1/4")		40mm (1-5/8")		50mm (2")		65mm (2-1/2")		75mm (3")		100mm (4")
Item No.	Kit No.	Qty	Kit No.	Qty	Kit No.	Qty	Kit No.	Qty	Kit No.	Qty	Kit No.	Qty
1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
2	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
1-2	202110	1	202110	1	202110	1	202110	1	202110	1	202110	1
3	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
4	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
5	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
3-5	202100	1	202100	1	202100	1	202100	1	202100	1	202100	1
6	Only Avail. with Kit	1	Only Avail with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
4-6	202120	1	202120	1	202120	1	202120	1	202120	1	202120	1
12	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
13	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
14	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	I	Only Avail. with Kit	1
15	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
3-5, 6, 12-15	202006	1	202006	1	202006	1	202006	1	202006	1	202006	1
	202007	1	202007	1	202007	1	202007	1	202007	1	202007	1
8	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1
11	Only Avail. with Kit	8	Only Avail. with Kit	8	Only Avail. with Kit	8	Only Avail. with Kit	8	Only Avail. with Kit	8	Only Avail. with Kit	8
16	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
1-6, 8, 11-16	202008	1	202008	1	202008	1	202008	1	202008	1	202008	1
	202009	1	202009	1	202009	1	202009	1	202009	1	202009	1
12-14, 16	202481	1	202481	1	202481	1	202481.	1	202481	1	202481	1
	202482	1	202482	1	202482	1	202482	1	202482	1	202482	1
17	Only Avail with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
19	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
16,17, 19	200770	1	200770	1	200770	1	200770	1	200770	1	200770	1
17	Only Avail with Kit	2	Only Avail with Kit	2	Only Avail. with Kit	2	Only Avail. with Kit	2	Only Avail. with Kit	2	Only Avail. with Kit	2
16,17, 19	200771	1	200771	1	200771	1	200771	1	200771	1	200771	1
16-19	202004	1	202004	1	202004	1	202004	1	202004	1	202004	1
16-19	202000	1	202000	1	202000	1	202001	1	202001	1	202001	1
	202004	1	202004	1	202004	1	202004	1	202004	1	202004	1
	202002	1	202002	1	202002	1	202003	1	202003	1	202003	1
27	202552	5	202552	5	202552	5	202552	5	202552	5	202552	5
28	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
29	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
19.28,29	200700	1	200725	1	200725	1	200685	1	200713	1	200716	1
30	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
29,30	200767	1	200389	1	200389	1	200391	1	200393	1	200227	1
32	Not Available		Not Available		Not Available		Not Available		Not Available		Not7vailable
34	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1	Only Avail, with Kit	1	Only Avail. with Kit	1
35	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1	Onlv Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit	1
36	Only Avail. with Kit	1	Only Avail. with Kit	1	Only Avail. with Kit