The phrase "a much valued" is correct and usable in written English.
It can be used to express appreciation or importance placed on something or someone.
Example: "She is a much valued member of our team, always contributing innovative ideas."
Alternatives: "highly regarded" or "greatly appreciated."
His great personal charm and gift for diplomacy made him a much valued and respected colleague.
I'm 32 and struggling with unwanted changes to a much valued friendship.
Finance minister has been a finance minister earlier, and he's a much valued and respected colleague, and we're very happy that he's there as a finance minister.
We remember her as one of the most admired professionals in her field, whose skill in casting singers and inimitable sense of humor made her a much valued and respected colleague.
"He has been a much valued colleague, providing a great deal of input into identifying future strategy for the Telegraph Media Group to ensure we remain a world-class and commercially successful media organisation.
Although only consecrated as a bishop in October last year and enthroned the following month, he was deemed to have such impressive credentials – including experience in conflict resolution and a much valued ability to "talk human" – that the panel decided he was its preferred option.
Gaining competitive success through technological superiority is a skill much valued by the seasoned European (and Japanese) managers with whom we talked.
Goodness is not a quality that's much valued nowadays.
She grew up in Long Island in fairly modest circumstances, but in a family that very much valued reading.
Economic historians with his training are a rarity in Germany, and much valued.
His first solo directorial feature, L'Immortelle, won the Louis Delluc prize, a much-valued critics award.
